Omega Constellation f300Hz The watch is in very good condition, almost NOS. The maintenance history of the watch and battery is unknown. This is a tuning fork timepiece with Omega Calibre 1250. The case diameter is 38 mm (measured without crown). The lug size is 20 mm. The watch has an original signed crown. The glass is made of Plexiglas, also signed with the Omega logo. The dial is truly splendid and impeccable. The photos are part of the description. The watch includes a new black leather strap with a length of 22 cm (including watch) Both the strap and the clasp are not original Omega. The original box and papers are not included with the watch either. The watch will be shipped well-packaged and by registered (insured) post.