17MM 18MM 19MM 20MM 21MM 22MM 23MM 24MM 26MM. Watches may share a visual resemblance, yet variations in case size or year model can distinguish them. It will not fit the following clasp: FC5037, FC5039 or FC5048 as they are designed for thicker 3mm thick strap at the buckle, so make sure you check the clasp you have before purchasing.
eBay