CASE MARKINGS

Watch cases often carry markings that are hidden between the lugs, on the inner case back, or along the case side. These can include model reference numbers, hallmarks indicating precious metal content, case maker stamps, and patent numbers. These markings are particularly important for identifying vintage watches where the case back engravings may have worn away over time.

The area between the lugs — the protruding extensions where the strap or bracelet attaches — is one of the most important locations for watch identification. Many manufacturers engrave the model reference number on the 12 o'clock side and the serial number on the 6 o'clock side. These markings are only visible when the bracelet or strap is removed, which is why they are often overlooked.

Case markings also include crown logos and brand emblems stamped or engraved into the case exterior, lug width indicators that specify the correct strap size, bezel insert codes on dive watches, and case size measurements. On precious metal watches, you may find assay office hallmarks, fineness stamps, and maker's marks that confirm the metal content and origin of the case.