A rare Omega Seamaster Automatic 1000m/3300ft Professional stainless steel cased diver's bracelet wristwatch, circa 1970s, the signed black dial with luminous hour markers and hands, centre seconds and date aperture, the tonneau shaped case with 60-minute rotating black bezel, the case back with anti-slip grooves, on a shark mesh bracelet with slipping clasp, the buckle back detailed 'Stainless Steel Omega 1247/237', case width 4.5cm. Note: the Omega Seamaster 1000 was nicknamed 'The Grand' by virtue of its 1000 metre rating and with a total run believed to be fewer than 500, it is regarded as a rare watch. The first 'Grand' was personally given by Prince Rainier III of Monaco to Jacques Cousteau, who was director of the Monaco Oceanographic Research Institute and Museum between 1957 and 1988. Cousteau declared it to be his favourite diving watch.