Omega, a gentleman's stainless steel divers wristwatch circa 1970 Seamaster 1000, automatic, circular dark blue matt dial, painted white luminous batons, centre sweep seconds, rotating black bezel calibrated for 50 minutes, date aperture, case, dial and bracelet signed, mesh bracelet with folding clasp. Width 4.5 cm. In 1970 Omega launched the Seamaster Professional 600, the 'PloProf', which was designed to endure extreme pressures at great depths.