A rare Omega Seamaster automatic 'Baby Ploprof' stainless steel cased diver's wristwatch, Ref. 166.0250, circa 1977, the signed and jewelled 1010 caliber movement numbered '41508088', the signed black dial with luminous baton hour markers and date aperture, the tonneau shaped case with 60-minute rotating bezel, the signed case back interior numbered '166.0250', case width 4cm, on an Omega stainless steel tapered link bracelet with signed foldover clasp. Note: in 1967 Omega released their first Seamaster 120, the 135.027, with a 37mm case. Around a dozen variations were made between 1967 and 1984 including this example, commonly referred to as the Baby Ploprof.