Rolex reference numbers explained: what each digit and letter means

A Rolex reference number looks like a code because it is one. Read the digits in the right order and most modern references tell you the model family, the bezel and the metal before you look at a photo. This guide explains the rules dealers use, and then does something most guides skip: it checks those rules against the references in our catalog and lists where they break.

If you don't know your watch's reference yet, start with our guide to finding your Rolex reference number. Once you have it, the Rolex price guide has a page for each reference we track.

The anatomy of a modern reference

Take the Rolex Submariner Date 126610LN. Read from left to right, a modern six-digit reference has three parts.

On many references the second-to-last digit also describes the bezel. That rule works well on dress models and poorly on sport models, as the tables below show.

SwissWatchExpo describes the first two to four digits as the model type, with each collection using its own prefixes. Generations show up as an extra leading digit. In our catalog, the Submariner Date ran as the 16610 from 1988 to 2010, the 116610LN from 2010 to 2020, and the 126610LN from 2020. The steel and white gold Datejust with a fluted bezel follows the same pattern: 16234, then 116234, then 126234. The last two digits, 34, stayed the same through all three, because the bezel and the metal did not change.

Three generations of one model can sit far apart in price, which is why the full reference matters when you compare listings.

The last digit: the metal

This is the most reliable rule. Bob's Watches calls the last digit a material code and lists these meanings. The examples in the third column are references in our catalog.

To test the rule, we grouped every five- and six-digit reference in our catalog by its last digit and read the recorded case metal. Most groups are consistent. These are the exceptions worth knowing:

• 4-digit references. Bob's Watches notes that the code does not reliably apply to vintage references with four digits. A gold Submariner 1680 is often written 1680/8, but the base reference is 1680.
• 7 does not tell you the metal. Guides list it as 14k yellow gold, but the Rolex Date 15037 ends in 7 and its catalog source describes it as 18k yellow gold, and two current references that end in 7 are made of RLX titanium: the Rolex Yacht-Master 42 226627 and the Rolex Deepsea Challenge 126067. Check the case metal on the papers or the reference page rather than reading it from a 7.
• 5 and the Everose date. Rolex introduced Everose gold in 2005, according to its materials page. On a watch made before then, a 5 can point to pink gold but not to Everose, so check the production years if a listing for an older watch says Everose. Some listings, and some of our own older records, simply say rose gold.
• 2 covers more than one look. Rolex introduced Rolesium on the Yacht-Master in 1999, and our catalog records several Yacht-Master references ending in 2 as steel with a platinum bezel. The Rolex Cosmograph Daytona 126502 also ends in 2 and pairs Oystersteel with platinum parts.
• Rolesor means gold parts, not a gold case. Rolex describes Rolesor as steel combined with gold on the bezel, bracelet and crown. On a white Rolesor watch, the gold can be little more than the bezel, which is why listings sometimes call it "steel".

The second-to-last digit: the bezel

SwissWatchExpo lists these bezel codes for the digit before the metal digit: 0 smooth or domed, 1 engine-turned, 2 engraved, 3 fluted, 4 bark or hand-crafted, 6 rotatable, 7 various. Here is how that holds up.

The pattern: on the Datejust, Day-Date and other dress models, the bezel digit is dependable. On the Submariner, GMT-Master II and Daytona, the digits before the metal code identify the model and generation, so don't read a bezel into them. For the bezels themselves, see our guide to Rolex bezel types.

Letter suffixes

Letters after the digits mostly describe the bezel insert, in French, plus gem settings. SwissWatchExpo lists these, among others:

Our catalog also uses RBR and TBR for diamond-set versions, as in the Rolex Day-Date 128395TBR. Suffixes are where nicknames attach: the green-bezel Rolex Submariner Date 126610LV “Starbucks” and the blue and black Rolex GMT-Master II 126710BLNR “Batgirl” are both on our Rolex nicknames page with the sources for each name.

Beyond the reference: dial and bracelet versions

A reference does not pin down every detail. SwissWatchExpo notes that the numbers say nothing about the dial or bracelet. Full catalog numbers add a four-digit suffix after a hyphen for the exact version, such as the dial: Heddels describes a GMT-Master II 116718LN-0001 with a black dial that had been fitted with a replacement dial to pass as the green-dial 116718LN-0002. If a listing gives a full catalog number, check that the dial in the photos matches it.

Bracelets vary within a reference too. In the 2026 French retail list published by 41watch, the Submariner appears only on an Oyster bracelet, while the Datejust 41 126300 and the GMT-Master II appear on both Oyster and Jubilee. The Yacht-Master appears on an Oyster bracelet or a rubber-and-metal Oysterflex.

How to use this when you shop

• Read the last digit first and confirm the metal matches the listing photos.
• Check the suffix against the bezel color you see.
• For dress models, check the bezel digit against the bezel on the watch.
• Compare the full reference, not the model name, with sold prices on its reference page.
• If anything doesn't match, ask the seller why before going further.

A mismatch is not always a fake. Parts get replaced in service, bracelets get swapped between owners, and listings contain typos. But a mismatch changes what the watch is worth, so get an explanation in writing before you agree a price, and have a watchmaker confirm it.