ROLEX FORENSICS

Professional-grade verification tools. Check serial years, validate clasp codes, and analyze movement beat rates instantly.

Bracelet Clasp Inspector

Enter the 2-3 digit alphanumeric code stamped on the hinge of the clasp.

Database Updated: Jan 2026

Authentication FAQ & Instructions

How do I find my Rolex Clasp Code? ▼
Open the bracelet clasp. The code is stamped on the inner hinge blade, often above the "STEELINOX" or "ROLEXSA" engraving. It consists of 1-3 letters followed by numbers. This code reveals the production month and year for models prior to 2011.
What does code ST9 mean on a Rolex? ▼
WARNING: "ST9" is a notorious code often found on counterfeit Rolex Submariners and Daytonas produced by replica factories. If your clasp says ST9, CL5, or OP8, it is highly likely to be a non-authentic item. Please verify with a certified watchmaker immediately.
Why is the sweep test important? ▼
Genuine Rolex mechanical movements (like Caliber 3135, 3235, 4130) operate at a frequency of 28,800 beats per hour (BPH). This creates a visual effect of 8 ticks per second, appearing almost smooth. Cheap replicas often use Quartz movements (1 tick/sec) or lower beat movements (21,600 BPH) which appear "choppy" or "stuttery" compared to the smooth glide of a real Rolex.