{"id":30919,"date":"2025-05-16T17:32:19","date_gmt":"2025-05-17T00:32:19","guid":{"rendered":"https:\/\/www.bobswatches.com\/rolex-blog\/?p=30919"},"modified":"2026-02-27T14:01:27","modified_gmt":"2026-02-27T22:01:27","slug":"letters-meaning-rolex-references","status":"publish","type":"post","link":"https:\/\/www.bobswatches.com\/rolex-blog\/resources\/letters-meaning-rolex-references.html","title":{"rendered":"Rolex Reference Number Guide"},"content":{"rendered":"\n

Have a Rolex reference number and want to know what it means? You\u2019re in the right place. Rolex model numbers might look random at first, but there\u2019s a clear system behind them. In this guide, we\u2019ll break down how to read any modern reference, from model family and case material to bezel type and more. But before we dive in, let\u2019s decode yours.<\/p>\n\n\n\n

Rolex Reference Number Guide: Understand Every Code<\/strong><\/h2>\n\n\n
\n
\"Rolex<\/figure><\/div>\n\n\n

So you’ve decided to buy a Rolex watch<\/a> – Congratulations! That means you’re either about to join the Rolex owners club or move one step closer to the throne as an existing member that has just added to their ever-growing collection.<\/p>\n\n\n\n

That\u2019s where this guide comes in. Below, we’ll break down the structure of modern Rolex reference numbers and explain what all those letters and digits mean – from bezel types to case materials and gem-set indicators.<\/p>\n\n\n\n

Let\u2019s start with a popular example: 126710BLRO<\/a>. If that looks familiar, it’s because it belongs to the Rolex GMT-Master II<\/a> with the red and blue “Pepsi” bezel, black dial, and Jubilee bracelet – one of the most recognizable modern models in Rolex’s catalog.<\/p>\n\n\n\n

That wasn’t always the case, though. Earlier Rolex models often had just four digits, like the legendary GMT-Master 1675<\/a>, a favorite among vintage collectors. These shorter reference numbers were common until Rolex gradually transitioned to longer, six-digit formats starting in the early 2000s. <\/p>\n\n\n\n

Today, most modern references – like 126710BLRO – include six digits plus a letter code to indicate features like bezel color or crystal type. So, what do those numbers and letters actually mean? Let\u2019s break it down.<\/p>\n\n\n\n

Rolex Model Codes<\/strong><\/h3>\n\n\n
\n
\"Rolex<\/figure><\/div>\n\n\n

The vast majority of modern Rolex reference numbers begin with either a “1” or a “2.” This leading digit can offer clues about a model’s generation, but it\u2019s not always definitive. For example, Rolex has steadily transitioned newer models to start with a “2,” while some collections – like the Sky-Dweller<\/a>, Pearlmaster<\/a>, and Cellini<\/a> – follow their own numbering conventions.<\/p>\n\n\n\n

More important are the three digits that follow<\/strong>, which typically identify the watch’s model family. While Rolex has never officially published this system, collectors have recognized consistent patterns over the years. Here’s a quick reference:<\/p>\n\n\n\n

\n
\n
\n
\n
\n
3-Digit Code<\/strong><\/td>Collection \/ Model Family<\/strong><\/td><\/tr>
124<\/td>Explorer<\/td><\/tr>
126 \/ 116<\/td>Datejust<\/td><\/tr>
140<\/td>Submariner (no date)<\/td><\/tr>
166<\/td>Submariner Date (5-digit era)<\/td><\/tr>
168<\/td>Submariner Date (precious metals)<\/td><\/tr>
165<\/td>Explorer II or Daytona*<\/td><\/tr>
162<\/td>Datejust 36 (older models)<\/td><\/tr>
167<\/td>GMT-Master \/ GMT-Master II<\/td><\/tr>
214<\/td>Milgauss<\/td><\/tr>
226<\/td>Sea-Dweller \/ Deepsea<\/td><\/tr>
268<\/td>Lady-Datejust \/ Pearlmaster<\/td><\/tr>
278<\/td>Datejust 31<\/td><\/tr>
279<\/td>Lady-Datejust 28<\/td><\/tr>
326<\/td>Sky-Dweller<\/td><\/tr><\/tbody><\/table><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/figure>\n\n\n\n

*<\/strong> While the Rolex Daytona<\/a> and Explorer II<\/a> both use the “165” family code, they’re distinguished by the number that comes before it: Explorer II references begin with “2<\/strong>” (like 216570<\/a>), while Daytona references begin with “1<\/strong>” (like 116500<\/a>). That prefix is key to telling them apart.<\/p>\n\n\n\n

Keep in mind that some family codes – especially for Submariner<\/a>, Datejust<\/a>, and GMT models – have evolved over time or vary by case material. The list above reflects the most commonly used identifiers for modern six-digit references.<\/p>\n\n\n\n

Rolex Bezel Codes<\/strong><\/h3>\n\n\n
\n
\"Rolex<\/figure><\/div>\n\n\n

The next number in the sequence will tell you the bezel type (so that\u2019s the fifth number). Bezel types are coded in the following way:<\/p>\n\n\n\n