Rolex Serial Numbers: Lookup, Check and Production Year Chart

Rolex serial numbers are the fastest way to learn when a watch was made. Every Rolex carries a unique serial on its case, and matching it against production records gives you an approximate year, a first check on originality, and a reference point for value. This guide covers every era from 1926 to 2026: the full production year chart, where to find the number, how to read reference numbers, clasp codes and country codes, and how to date the modern watches that most charts skip. My Watch LLC buys, sells and trades Rolex watches in every condition, from new unworn 2026 examples to used watches from every decade below.

• Year Chart
• Serial Location
• Random Serials
• Reference Numbers
• Clasp Codes
• Country Codes
• Sapphire Timeline
• Serial Check
• FAQ

Rolex Serial Numbers by Year

Rolex has never published an official serial number list. The chart below is compiled from decades of dealer and collector records, and each figure is the approximate serial Rolex had reached in that year. Read it as accurate to within a year or two, because cases were numbered first and assembled, shipped and sold later.

2010 to 2026: Random Serials

From 2010 onward every Rolex carries an eight character serial that mixes letters and numbers with no sequence, for example 4K7R92Q1. The serial confirms the watch is from 2010 or later but does not reveal the year. See how to date a random serial Rolex below.

1987 to 2010: Letter Prefix Serials

When the numbers approached ten million in 1987, Rolex switched to a letter followed by six digits. The letters did not run alphabetically, and neighboring letters overlap by several months.

1954 to 1987: Second Numeric Series

Rolex reached 999,999 around 1954 and restarted the count instead of adding a seventh digit. Numbering climbed back past one million by about 1964 and continued to 9,999,999.

1926 to 1953: First Numeric Series

Where Is the Serial Number on a Rolex?

The location depends on when the watch was made.

To read a serial between the lugs, the bracelet has to come off at the 6 o'clock side. Push the spring bar in with a proper spring bar tool, or have a watchmaker do it, since a slip will scratch the lugs. On a rehaut watch you need nothing but good light: tilt the dial and read the engraving below the 6 o'clock marker, under the repeating ROLEX text.

The serial is also printed on the warranty card or punched into older guarantee papers. The number on the papers must match the case exactly.

How to Date a Rolex With a Random Serial Number

Most Rolex watches on the market today were made after 2010, which is exactly where serial charts stop being useful. These are the four things dealers use instead.

1. The warranty card

The sale date on the card is the best single data point. The card style narrows it further: punched paper certificates ran through the mid 2000s, plastic cards carrying a country code ran from about 2006 to 2020, and the current card without a country code arrived in 2020.

2. The reference generation

Rolex did not move every model to a new reference in the same year. Each model changed in its own year, when it received its new generation movement, and that year is a hard floor for dating: a watch cannot be older than its reference. The table lists every change in order.

Two examples show how this works. A Daytona 116500LN was made between 2016 and 2023, and a 126500LN was made in 2023 or later. A Sky-Dweller 326934 was made between 2017 and 2023, and a 336934 was made in 2023 or later. The first Sky-Dweller references of 2012 were solid gold only. The Rolesor references 326934 and 326933 joined in 2017.

3. The movement and dial details

The caliber column above is the second check: the movement inside must match the reference. The dial gives a third. The 336xxx Sky-Dweller and the 1265xx Daytona carry a small Rolex coronet between the words SWISS and MADE at 6 o'clock. The 326xxx Sky-Dweller and the 1165xx Daytona do not.

4. A serial check

When the card is missing, a serial check can return the original sale date directly.

How to Read Rolex Reference Numbers

The reference number (also called the model number) is shared by every watch of the same configuration. Vintage references have four digits, references from the late 1970s have five, and references since about 2000 have six. On five and six digit references the last digit identifies the metal, the digit before it usually describes the bezel, and the leading digits identify the model family.

Last Digit: Case Material

Second to Last Digit: Bezel

This code is most reliable on the Datejust, Day-Date and Oyster Perpetual families. Sport models do not follow it consistently.

Letter Suffixes

Letters after the number abbreviate French terms for the bezel or crystal. LN is lunette noire (black bezel), and BLRO is bleu rouge, the blue and red of the Rolex Pepsi. BLNR marks the Batman and Batgirl, CHNR the Rootbeer, GRNR the Bruce Wayne, and VTNR the Sprite.

Reference Numbers by Model

Each list runs from older to newer generations.

Rolex Clasp Codes

From 1976 to 2010 Rolex stamped a date code inside the clasp blade. The letters give the year and the number that follows gives the month, so CL4 is April 2004 and X11 is November 1999. An added S marks a service replacement clasp supplied by Rolex. From 2011 the codes became random three character stamps that cannot be dated.

A clasp code dates the bracelet, not the watch. A clasp within a year or so of the case serial suggests the original bracelet. A large gap usually means the bracelet was replaced at some point, which is common and not a fault by itself, though it matters to collectors of vintage pieces.

Rolex Country Codes

Rolex guarantee papers and warranty cards issued from about 1980 to 2020 carry a three digit code for the market the watch was first delivered to. On paper certificates it is punched or printed near the top. On plastic cards from about 2006 to 2020 it sits on the back. Cards issued since 2020 no longer show it. Rolex never published the list, so the codes below come from collector records and may not be complete.

Watches delivered through Rolex USA were generally issued papers without a country code, although 710 is recorded for the United States. The code affects nothing about the watch itself: every Rolex is made to the same standard in Switzerland.

Europe

Asia and Pacific

Middle East and Africa

Americas and Caribbean

Military exchanges

Red Letter Date Stamps on US Papers

Some older papers from Rolex USA carry a short code stamped in red letters showing when the watch shipped to the dealer. The ten letters of ROLEXWATCH stand for the digits 1 through 0 in order (R is 1, O is 2, L is 3, E is 4, X is 5, W is 6, A is 7, T is 8, C is 9, H is 0). The month comes first and the year second, so L RCCT reads 3 and 1998: March 1998.

When Rolex Switched to Sapphire Crystals

Rolex moved from acrylic to scratch resistant sapphire one model at a time over about twenty years. If a watch carries a crystal that does not fit its serial year, it has either been serviced with a different part or deserves a closer look.

Rolex Serial Number Check Service

A chart gives you a year. It cannot tell you whether a watch is stolen or whether the dial on it is the one it was born with. My Watch LLC offers a paid Rolex serial check that reports:

• The original sale date
• Whether the watch has been reported stolen
• The dial the watch originally left with
• The movement serial number

It is the most useful step you can take before buying from a private seller or paying a premium for originality. Call or text 248-422-0909 or reach us through our contact page with the serial and reference number.