I would like info about the vintage deployement clasp No 27 . I have one on a watch that is 18 mm and i have found a 16 mm on Ebay . I wonder what dimensions the strap should be . A have a strap but not sure it fits the 16 mm clasp . Not sure it's original either . It is 13,5 -14 mm in locked position .
Two types of buckle which appear identical: 18mm, which fits a 16mm lock fitting end and are usually either 22mm bands or the Megaquartz style 18mm fitting with a much wider end. 16mm, which fits a 14mm lock fitting end and are usually for 18-20mm bands for the chronostop and other 20mm fittings