Tudor serial numbers are typically found engraved between the lugs of the watch case, most commonly at the 6 o'clock position. To view the serial number, it is usually necessary to remove the bracelet or strap. The format generally consists of a sequence of digits, and vintage Tudor watches often share serial number ranges that overlap with Rolex ranges, reflecting the close manufacturing relationship between the two brands.
For much of the 20th century, Tudor serial numbers broadly followed a progression that can be cross-referenced with known production date ranges compiled by collector communities. However, the serial number alone does not always provide a precise production date, and cross-referencing with the model reference, dial characteristics, and movement type is commonly recommended. Tudor transitioned to random serial numbers at various points, which can complicate dating for certain eras.
Modern Tudor watches continue to display the serial number between the lugs, with the reference number often found on the opposite side at 12 o'clock. Tudor's official service centers can sometimes verify production dates using internal records, though availability of historical data may vary. Collector databases and Tudor enthusiast forums are often valuable resources for serial number research.