Food & drink
Mars Duo 78.8 g two-bar wrapper
1 / 4 Front
2 / 4 Back
3 / 4 Ingredients
4 / 4 NutritionMade in
United Kingdom
The British and Irish two-bar Mars Duo, 2 x 39.4 g of caramel and nougat in milk chocolate, made in the United Kingdom by Mars Wrigley Confectionery UK.
Size & format
+15 more · All 18 versions in 26 countries
5000159551724Where to buy
Other stores
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Evidence awaiting context review
Market not established · unconfirmed
Evidence reviewed
These facts have not yet been grouped into confirmed label or edition contexts. Market and date qualifications belong to each source.
Context, dates & evidence notes · Other observations
Other observations & source differences (3)
Different sources or national labels can coexist. Differences alone do not establish a change to the product.
- GB and IE wrapper, photos 2025 supported · Compare evidence
Read from the Open Food Facts ingredients (imgid 9), nutrition (imgid 7) and front (imgid 8) photos uploaded 2025-10-30; the back photographed on 2025-09-13 (imgid 4) prints the same statement above the GB and IE consumer blocks, and the nutrition table photographed on 2025-03-27 (imgid 3) prints the same figures.
- Manufacturer specification on Erudus (GB IE) supported · Compare evidence
Erudus record 11011, version 2.0, changed and reviewed 2024-11-15, supplied by the manufacturer; manufacturer product code 453945; inner component weight 0.08 kg, 32 units per outer case, shelf life 364 days from production; the statement matches the wrapper word for word.
- Evidence awaiting context review unconfirmed · selected
Product facts
Explore the family ↗- Barcode
- 5000159551724 check digit OK
- Brand
- Mars
- Ultimately owned by
- Mars, Incorporated (🇺🇸 United States)
- Family
- Mars bar
- Category
- Food/Beverage, Confectionery/Sugar Sweetening Products, Confectionery Products, Chocolate and Chocolate/Sugar Candy Combinations - Confectionery
- Net content
- 78.8 g
- Pack
- two-bar wrapper
- Sold in
- 🇬🇧 United Kingdom[1], 🇮🇪 Ireland[1]
- Pieces
- 2
- Last observed on sale
- 2026-09-25
- Last sale evidence
- In stock at GBP 2.15 at The Grocery Store, Wembley, London, on Devo.
- Made in
- 🇬🇧 United Kingdom
- GS1 prefix
- 500 · United Kingdom
Who owns it
Mars ↗Made in the United Kingdom · owned from the United States
- Ultimately owned by
- Mars, Incorporated · United States
- Chain
- Mars → Mars, Incorporated
- Made in
- United Kingdom
Sources for each tie
- Mars → Mars, IncorporatedWikipedia ↗
The ownership drawing
No company above it
ownssince 1932
What the sources say about these ties
- Mars, Incorporated owns
- Wikipedia names Mars Inc. as the producer of the Mars bar since 1932.
Built from the ownership rows on the brand and company pages, each cited where it is recorded. Made in is the country of production on this product's record; the GS1 prefix of a barcode names the issuing organisation, not where the product was made.
About this product
Mars Duo 78.8 g is the two-bar pack of the Mars bar for Britain and Ireland: two 39.4 g bars of milk chocolate (40%) with soft nougat (32%) and a caramel centre (27%) in one wrapper, the recipe Forrest Mars Sr. first made in Slough in 1932.[2][3] The manufacturer's specification, titled for the GB and IE markets, gives Mars in Slough as the maker and the United Kingdom as the country of origin, packed 32 to a case.[4] The wrapper prints a British consumer block for Mars Wrigley Confectionery UK and an Irish one for Mars Foods Ireland, and each bar carries 174 kcal.[1][2] It is labelled suitable for vegetarians.[2]
The Duo replaced the single king-size Mars bar; when Wikipedia described the range as of 2008 it weighed 85 g.[3] A London convenience store sold it at GBP 2.15 in September 2026, and the Irish discount chain MrPRICE listed it online at EUR 1.49.[5][6]
Where it's sold
- Mars Duo at The Grocery Store, Wembley, London [5] United Kingdom GBP 2.15 · new The Grocery Store, Wembley, London HA9: Mars Duo, 78.8 g, in stock; the listing URL carries this barcode.
- Mars Duo Chocolate Bar 2 x 39.4g, MrPRICE.online [6] Ireland EUR 1.49 · new MrPRICE, the Irish discount chain's online shop, lists "Mars Duo Chocolate Bar 2 x 39.4g" with this barcode as its product barcode and SKU, at EUR 1.49, shown as sold out online.
- Amazon.co.uk [8] United Kingdom new Amazon.co.uk ASIN B01ET7KD1K "Mars Duo 78.8g", 78.8 g pack of 1, under Grocery > Food Cupboard > Snacks & Sweets > Chocolate Candy > Blocks & Bars, manufacturer Mars Wrigley Confectionery UK; name, brand and net content match but the page prints no barcode, and the earlier Duo code 5000159470490 is an equal match. Shown as currently unavailable, with no price.
- Erudus specification 11011 information[4] United Kingdom Manufacturer specification titled "MARS Duo 32x2x39.4g GB IE", inner component GTIN 5000159551724 in an outer case of 32 (case GTIN 5000159551717), country of origin United Kingdom. · made in United Kingdom
- GB-marked consumer block with the UK freephone 0800 952 0077 and Freepost Mars Wrigley Confectionery UK Ltd.[1] United Kingdom
- IE-marked consumer block for Mars Foods Ireland Ltd, PO Box 3856, Dublin 4, with the Irish number 1890 812 315.[1] Ireland
A listing is evidence that this barcode is sold there, on that date; a price is what that listing showed, not a recommended price. Store links may be affiliate links (how this works).
18 versions of Mars bar
Sold in 26 countries, 3 of 18 sold in one country only
United Kingdom
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 3 bars | 118.2 g | price-marked multipack flow wrap | IE | 5000159564038 |
| Mars 4 bars | 157.6 g | multipack flow wrap | IE, US | 5000159484527 |
| 157.6 g | multipack flow wrap | IE | 5000159551823 | |
| Mars 4 x 51 g | 204 g | flow-wrapped multipack | IE | 5000159481090 |
| Mars 51 g single bar | 51 g | flow wrap | IE | 5000159470476 |
| Mars 51 g single bar, 75p price-mark | 51 g | price-marked flow wrap (75p) | 5000159565004 | |
| Mars 51 g single bar, later code | 51 g | flow wrap | IE, ES | 5000159551694 |
| Mars Duo | 78.8 g | two-bar wrapper | FR | 5000159470490 |
| 78.8 g this page | two-bar wrapper | IE | 5000159551724 | |
| Mars snack size, 9 bars | 304.2 g | multipack flow wrap | IE | 5000159521406 |
Ireland
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 3 bars | 118.2 g | price-marked multipack flow wrap | GB | 5000159564038 |
| Mars 4 bars | 157.6 g | multipack flow wrap | GB, US | 5000159484527 |
| 157.6 g | multipack flow wrap | GB | 5000159551823 | |
| Mars 4 x 51 g | 204 g | flow-wrapped multipack | GB | 5000159481090 |
| Mars 51 g single bar | 51 g | flow wrap | GB | 5000159470476 |
| Mars 51 g single bar, later code | 51 g | flow wrap | GB, ES | 5000159551694 |
| Mars Duo this page | 78.8 g | two-bar wrapper | GB | 5000159551724 |
| Mars snack size, 9 bars | 304.2 g | multipack flow wrap | GB | 5000159521406 |
France
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, multilingual pack (Veghel) | 51 g | flow wrap | BE, NL, PL, FI, IT, MT | 5000159407236 |
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | DE, AT, CH, CZ, SK, PL, TR, NG, KE | 5900951311321 |
| Mars Duo | 78.8 g | two-bar wrapper | GB | 5000159470490 |
| 78.8 g | two-bar wrapper | 5000159519328 |
Switzerland
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g | 70 g | flow wrap | UA | 5000159408301 |
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | DE, AT, SE, NO, DK, FI, MT | 5900951311215 |
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, AT, CZ, SK, PL, TR, NG, KE | 5900951311321 |
Austria
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | DE, CH, SE, NO, DK, FI, MT | 5900951311215 |
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, CH, CZ, SK, PL, TR, NG, KE | 5900951311321 |
Finland
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | DE, AT, CH, SE, NO, DK, MT | 5900951311215 |
| Mars 51 g single bar, multilingual pack (Veghel) | 51 g | flow wrap | FR, BE, NL, PL, IT, MT | 5000159407236 |
Germany
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | AT, CH, SE, NO, DK, FI, MT | 5900951311215 |
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, AT, CH, CZ, SK, PL, TR, NG, KE | 5900951311321 |
Malta
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | DE, AT, CH, SE, NO, DK, FI | 5900951311215 |
| Mars 51 g single bar, multilingual pack (Veghel) | 51 g | flow wrap | FR, BE, NL, PL, FI, IT | 5000159407236 |
Poland
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, multilingual pack (Veghel) | 51 g | flow wrap | FR, BE, NL, FI, IT, MT | 5000159407236 |
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, AT, CH, CZ, SK, TR, NG, KE | 5900951311321 |
Australia
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 47 g single bar | 47 g | paper-based wrapper | NZ | 9300682059015 |
Belgium
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, multilingual pack (Veghel) | 51 g | flow wrap | FR, NL, PL, FI, IT, MT | 5000159407236 |
Canada
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 Pack 85 g | 85 g | wrapper | 058496328757 |
Czechia
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, AT, CH, SK, PL, TR, NG, KE | 5900951311321 |
Denmark
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | DE, AT, CH, SE, NO, FI, MT | 5900951311215 |
Italy
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, multilingual pack (Veghel) | 51 g | flow wrap | FR, BE, NL, PL, FI, MT | 5000159407236 |
Kenya
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, AT, CH, CZ, SK, PL, TR, NG | 5900951311321 |
Netherlands
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, multilingual pack (Veghel) | 51 g | flow wrap | FR, BE, PL, FI, IT, MT | 5000159407236 |
New Zealand
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 47 g single bar | 47 g | paper-based wrapper | AU | 9300682059015 |
Nigeria
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, AT, CH, CZ, SK, PL, TR, KE | 5900951311321 |
Norway
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | DE, AT, CH, SE, DK, FI, MT | 5900951311215 |
Slovakia
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, AT, CH, CZ, PL, TR, NG, KE | 5900951311321 |
Spain
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, later code | 51 g | flow wrap | GB, IE | 5000159551694 |
Sweden
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g, Polish-prefix pack | 70 g | flow wrap | DE, AT, CH, NO, DK, FI, MT | 5900951311215 |
Türkiye
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 51 g single bar, Polish-prefix pack | 51 g | flow wrap | FR, DE, AT, CH, CZ, SK, PL, NG, KE | 5900951311321 |
Ukraine
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 x 35 g | 70 g | flow wrap | CH | 5000159408301 |
United States
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 4 bars | 157.6 g | multipack flow wrap | GB, IE | 5000159484527 |
Country not recorded
| Version | Size | Pack | Also sold in | Barcode |
|---|---|---|---|---|
| Mars 2 Pack King Size | – | wrapper | 5000159372251 |
Reviews
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Sources & research
Evidence reviewed
Open Food Facts
Back of the Mars Duo wrapper with the GB and IE consumer blocks
pack · Accessed 2026-09-25
Source & attribution [1] ↗Erudus (via Templeman)
Erudus specification 11011: MARS Duo 32x2x39.4g GB IE Everest
registry · Accessed 2026-09-25
Source & attribution [4] ↗Coverage & research gaps (8)
Coverage measures the evidence recorded here. It does not rate the product.
- Identity: 3 / 3 · Name, brand and classification recorded
- Context: 2 / 3 · Evidence groups assigned to a researched label, edition or analysis
- Label photographs: 0 / 2 · Researched contexts with an assigned photograph
- GB and IE wrapper, photos 2025: nutrient evidence: 20 / 20 · Recorded nutrient rows linked to a source; not the number of nutrients that ought to exist
- Manufacturer specification on Erudus (GB IE): nutrient evidence: 8 / 8 · Recorded nutrient rows linked to a source; not the number of nutrients that ought to exist
- nutrition · disputed: The typed Open Food Facts values for this barcode (722.7 kJ, 532 kcal, 6.3 g fat, 27 g carbohydrate, 24 g sugars, 1.8 g protein, 0.67 g salt per 100 g) mix the per-bar column with other figures and contradict the photographed table, so they are not used.
- markets · unknown: Searched amazon.ie on 2026-09-25 for "Mars Duo 78.8g", "Mars" and 5000159551724 (with a Dublin delivery address): no single Duo pack was found; B01ET7KD1K answers 404 there, and the only Duo listing, B0074FP87E, is a box of 32 bars at EUR 62.99 from London Food Hall Ireland, printing no barcode.
- markets · unknown: Searched amazon.co.uk on 2026-09-25 for "Mars Duo 78.8g", "Mars" and 5000159551724 (the barcode search returned no results). Besides the unavailable single B01ET7KD1K, the Duo listings are boxes of 32 (B0074FP87E at GBP 31.99 from Kidzkandy) and B00WUEQ69I "Mars Chocolate Duo Chocolate Bar, 79 g", unavailable and printing no barcode.
- markets · unknown: The US import shop Brits R U.S. lists "Mars Bar Duo" with this barcode as its SKU, shown out of stock on 2026-09-25; no US storefront was searched, so US is not in country_of_sale.
- evidence · stale: Evidence was observed over a year ago; check for newer labels. Historical evidence remains valid.
- schema · schema_gap: Review and assign legacy facts to coherent observations.
- ingredients · not_researched: Ingredient statement or sourced exemption not recorded.
- nutrition · not_researched: Nutrition declaration or exemption not recorded.
All references & source details
References
- ↑ Back of the Mars Duo wrapper with the GB and IE consumer blocks Open Food Facts. pack. Published 2025-09-13. Accessed 2026-09-25. Record: 5000159551724. imgid 4, 720 x 1280 px. CC BY-SA 3.0. Open Food Facts contributors. Upstream: off.
- ↑ Ingredient statement, nutrition table and front of the Mars Duo wrapper Open Food Facts. pack. Published 2025-10-30. Accessed 2026-09-25. Record: 5000159551724. imgids 9 (ingredients), 7 (nutrition) and 8 (front), uploaded 2025-10-30. CC BY-SA 3.0. Open Food Facts contributors. Upstream: off.
- ↑ Mars bar Wikipedia. publication. Accessed 2026-09-25. CC BY-SA. Wikipedia contributors.
- ↑ Erudus specification 11011: MARS Duo 32x2x39.4g GB IE Everest Erudus (via Templeman). registry. Published 2024-11-15. Accessed 2026-09-25. Record: 1f7afca444004f739624229ba7b307c4. inner component GTIN 5000159551724, outer case GTIN 5000159551717.
- ↑ Mars Duo at The Grocery Store, Wembley, London Devo. retailer. Accessed 2026-09-25. Record: 5000159551724. GBP 2.15, in stock.
- ↑ Mars Duo Chocolate Bar 2 x 39.4g, MrPRICE.online MrPRICE. retailer. Accessed 2026-09-25. Record: 5000159551724. EUR 1.49, sold out online.
- ↑ GDSN trading partners: GS1 GDSN member companies and their GLNs GS1. registry. Accessed 2026-09-25. Record: 5000159000000.
- ↑ Mars Duo 78.8g : Amazon.co.uk: Grocery Amazon.co.uk. retailer. Accessed 2026-09-25. Record: B01ET7KD1K. model number 105896211, currently unavailable.
Further sources
Additional sources recorded for this entry, including other observations and related pages.
- Open Food Facts: Mars Duo (5000159551724) Open Food Facts. catalogue. Accessed 2026-09-25. Record: 5000159551724. ODbL. Open Food Facts contributors.
Barcode & identifiers
- GTIN-14
05000159551724- EAN-13 / GTIN-13
5000159551724
Read the complete structured record (JSON) ↗ · Barcode image ↗
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Explore the observations, changes and sources behind this record.
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