Decoding Rolex reference numbers (also called model numbers) is the key to identifying a watch's model, materials, and specific features. The system has evolved over time from four to six digits, but the general breakdown remains a coded language.
Here is a guide on how to read the modern six-digit Rolex reference number:
1. Where to Find the Number
The reference number is engraved on the case of the watch in one of two places:
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Between the Lugs (at 12 o'clock): You must remove the bracelet to see the number engraved on the case between the top set of lugs.
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Warranty Card/Official Documentation: The reference number is clearly printed on the warranty card and original sales receipt.
2. The Structure: Six Digits + Letter Code (XXXXXX-XX)
A modern Rolex reference number is broken down into three main parts: Model/Series, Bezel Type, and Material, often followed by a Letter Suffix for specific colors or gems.
A. The First Digits (Model/Series)
The first 3 to 4 digits indicate the model family or collection the watch belongs to.
| Prefix (First 3-4 Digits) | Model Family |
| 1266, 1166 | Submariner Date / Sea-Dweller |
| 1165, 1265 | Cosmograph Daytona |
| 1267, 1167 | GMT-Master II |
| 1263, 1163 | Datejust 41 / Datejust II |
| 1282, 1182 | Day-Date 36 |
| 1242, 1260 | Explorer / Oyster Perpetual |
B. The Second-to-Last Digit (Bezel Type)
For Datejust, Day-Date, and other Classic lines, the second-to-last digit indicates the bezel style. This code is generally not used for Professional (Sports) models like the Submariner or GMT-Master.
| Code | Bezel Style |
| 0 | Smooth / Domed |
| 1 | Engine-Turned / Rotatable (Older) |
| 3 | Fluted (Classic Rolex design) |
| 4 | Gem-Set (Often for diamonds) |
| 6 | Rotatable (Used for some special Datejusts) |
C. The Final Digit (Case Material)
The last digit is the most consistent and important code, indicating the metal(s) used in the case and bracelet.
| Code | Material | Example |
| 0 | Stainless Steel (Oystersteel) | 126610 |
| 1 | Two-Tone Everose Rolesor (Steel & Everose Gold) | 126331 |
| 2 | Rolesium (Steel & Platinum) | 126622 |
| 3 | Two-Tone Yellow Rolesor (Steel & Yellow Gold) | 126613 |
| 4 | Two-Tone White Rolesor (Steel & White Gold Bezel) | 126334 |
| 5 | 18K Everose Gold | 126715 |
| 6 | 950 Platinum | 228206 |
| 7 | 14K Yellow Gold (Vintage) / Titanium (Modern RLX) | N/A |
| 8 | 18K Yellow Gold | 126618 |
| 9 | 18K White Gold | 126719 |
D. The Letter Suffix (Color/Gems)
Modern reference numbers for Professional models (especially those with ceramic bezels) often end in a 2-to-4-letter code, usually derived from French words, which describes the bezel color or setting.
| Code | Meaning (French) | Description | Example Model |
| LN | Lunette Noir (Black Bezel) | Black ceramic bezel | Submariner 126610LN |
| LV | Lunette Verte (Green Bezel) | Green ceramic bezel | Submariner 126610LV (Kermit/Starbucks) |
| BLNR | Bleu/Noir (Blue/Black) | Blue and black ceramic bezel | GMT-Master II (Batman) |
| BLRO | Bleu/Rouge (Blue/Red) | Blue and red ceramic bezel | GMT-Master II (Pepsi) |
| CHNR | Chocolat/Noir (Brown/Black) | Brown and black ceramic bezel | GMT-Master II (Root Beer) |
| GV | Glace Verte (Green Glass) | Green sapphire crystal | Milgauss |
Example Breakdown
Let's break down the model number 126710BLNR:
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1267: Identifies the watch as a modern GMT-Master II.
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1: Denotes the previous generation update/series (largely internal coding).
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0: Indicates the material is Stainless Steel.
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BLNR: Indicates the bezel colors are Blue and Black (the "Batman").
