Nice sleek and strong profile to this brushed stainless steel 18mm inner opening vintage watch strap buckle -- a difficult type and size to find. This is a New Old Stock (NOS) vintage watch strap buckle. Buckle size is 18mm, so it will fit straps that have a 18mm buckle end (often these are straps with 18mm 19mm 20mm or 22mm lug end sizes). It has a flat finish. Nice big size, beefy SS buckle.

Top to bottom clearance is 10mm so this buckle will work on anything from thick, padded straps to flat straps. Note the thicker than usual tang (tongue piece) on this buckle.

Buy with confidence from a seller with more than 19,000 positive feedbacks on EBAY since 1998 and a member of the NAWCC watch collector's association since 1997.