1979 Omega Seamaster 120 (Ref. 166.0251) "Baby Ploprof"

There is something about the early vintage Omega Seamsters that truly embodies the golden era of dive watches of the 1960-1970s. Omega has a long history and heritage in dive watches, which dates back to the 1930s.  The seahorse adorned case back of the Seamaster series pays tribute to Neptune, the Roman god of the sea. The seahorse logo was conceived by engraver Jean-Pierre Borle.  He was inspired by an image of Neptune driving a chariot pulled by seahorses, which is why the Omega seahorses are depicted wearing bridles.

Omega released the Seamaster 120 Ref (166.088.) in 1969 and continued production of through 1974. Omega released four versions of the Seamaster 120 from its launch in 1969 until the last production of the reference in 1980/81. The common features of the Seamaster 120's of this era are the bi-directional bakelite bezel insert, the date feature, the screw down crown, and the absence of crown guards.

This specific Omega Seamaster Ref. 166.0251 is the rarest version of the Seamaster 120 series and is commonly referred to a Baby Ploprof as it adorns the same hands as the larger Omega Seamaster Ploprof.

Stock # OMSM12079
Brand Omega
Style Seamster
Model 120
Serial 42XXXXXX
Size Men's
Material SS
Dial Black Matte
Millimeters 39
Bracelet Omega 1321/295 Integrated Bracelet



The stunning case of this Seamaster remains unpolished and retaining the original factory finish. The fully graduated and luminous bakelite bezel is also in stunning condition showing no cracking or delamination. The integrated Omega 1321/295 bracelet is also in original condition showing little wear and minimal stretch. 


The excellent dial is in original condition. The tritium lume plots have taken on a charming creamy patina, showing no lume degradation when inspected under U.V. light. The original tritium Ploprof hands are also in flawless condition showing no lume degradation under U.V. light inspection.


None. Watch was recently serviced and is running at COSC spec backed by a 1 year warranty on accurate timekeeping