Rolex Watch Markings & Identification Guide

On Rolex watches produced before approximately 2005, the serial number is typically engraved between the lugs on the case side at the 6 o'clock position, which is only visible when the bracelet or strap is removed. Starting around 2005, Rolex began engraving the serial number on the inner rehaut, the ring visible between the dial and crystal. Some transitional-era watches may have the serial engraved in both locations.

For watches produced before approximately 2010, the serial number can often be cross-referenced with published serial number charts that associate number ranges and letter prefixes with approximate production years. For newer watches with random serial numbers, the warranty card date, reference number production periods, and clasp codes are commonly used to estimate the production year. Authorized Rolex service centers may also be able to provide production information.

Rolex used a green hologram sticker on the case back of new watches as an anti-counterfeiting measure from approximately the late 1980s through 2007. The sticker featured a crown logo that shifted when viewed from different angles. Rolex discontinued the hologram sticker around 2007, reportedly because counterfeiters had become adept at replicating it. Its absence on newer watches is entirely normal.

On modern Rolex watches produced after approximately 2005, the inner rehaut features the Rolex crown logo repeated around its circumference, along with the serial number engraved at the 6 o'clock position. This rehaut engraving serves both as a branding element and an authentication feature. The quality and precision of the rehaut engraving are commonly examined when assessing authenticity.

Beginning around 2002, Rolex introduced a micro-etched crown logo on the crystal at approximately the 6 o'clock position. This laser-etched marking is extremely small and typically very difficult to see with the naked eye, but it becomes visible under magnification or when light hits it at certain angles. Its presence is commonly checked during authentication, though its absence on pre-2002 watches is normal.

Rolex uses 904L stainless steel, which the brand calls Oystersteel, for its steel watch cases and bracelets. This alloy offers greater corrosion resistance and a higher polish compared to the 316L stainless steel commonly used by most other watch manufacturers. Rolex adopted 904L steel across its product line in 2003, and the material is often cited as a distinguishing feature of genuine Rolex watches.

Rolex clasps often feature stamped codes on the interior that can indicate the production period of the bracelet. These typically include letter and number combinations that correspond to the manufacturing quarter and year. However, clasp codes indicate when the bracelet was made, which may differ from the watch case production date if the bracelet was replaced or serviced. Clasp codes are distinct from the case serial number.

Authenticating a Rolex typically involves examining multiple features including the serial number engraving quality, the Cyclops magnification over the date window, the micro-etched crown on the crystal, the weight and finishing of the case and bracelet, and the movement accuracy. Modern counterfeits can be highly sophisticated, so professional authentication by an authorized Rolex service center or a qualified independent watchmaker with Rolex expertise is strongly recommended for any significant purchase.