18mm

Auth Tudor Stainless Steel 18mm Deployant Clasp Auth Tudor Stainless Steel Deployant Clasp, Takes 18mm wide strap ends, Pre owned.  

Vintage Omega Seamaster 18mm Steel Watch Bracelet 1501 / 823 no 32 Clasp Vintage Omega Seamaster 18mm Steel Watch Bracelet 1501 / 823 no 32 Clasp, measures 144mm long when closed. A watchmakers find!