DIAM. 35 mm. THICKNESS 13 mm. Part of the first series of the Seamaster chro nograp h featuring a screwdown caseback Antiquorum has never offered a refere nce 14364 before. This reference was only produced for a few years and featured the caliber 321 the same used in the first generation of the Omega Speedmaster ref 2915 and was used until 1968.