1970 Omega Seamaster 120 (Ref. 166.073) “Deep Blue”

There is something about the early vintage Omega Seamaster that truly embodies the golden era of dive watches of the 1960-1970s. Omega has a long history and heritage in dive watches, which date 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.

The "Deep Blue" Omega Seamaster 120 ref. 166.073 is a stunning timepiece that is both functional and stylish. Its combination of beauty, history, and performance makes it a true collector's item, and a watch that you can be proud to wear for years to come. The defining difference between the Omega Seamaster Deep Blue from other dive watches of the era is execution, with an overall design that feels very familiar but with an aesthetic that outclasses its counterparts. As it was only produced for 4 years, from 1970 to 1974, the Deep Blue is certainly an uncommon timepiece, but to be found in the condition of the watch we're proud to offer here is truly rare. 

Stock # OMSM120DB
Brand Omega
Style Seamaster 120
Model 166.073
Serial 30XXXXXX
Size Men's
Material Stainless Steel
Dial Glossy Blue
Millimeters 42.5
Bracelet Omega 1153/138 Bracelet W/ 634 End Pieces


The impressive case features extremely broad straight lugs with rounded finishing that gives the watch a very robust appearance. The case shows no defining evidence of being previously polished and shows gentle, but honest signs of use throughout. The original "Deep Blue" bakelite is in exceptional condition, showing only gentle signs of use and no cracking. The tritium lume numerals in the bezel match the dial patina nearly perfectly. The case retains its original Omega signed screw-down crown, which also operated the quick-set date function. The case back retains all of its factory engravings in deep and crisp condition. The Omega 1153/138 bracelet with 634 end pieces is believed to be original to the watch and retains 20 links that show minimal stretch and will fit up to a 7 1/4-inch wrist.


The glossy "Deep Blue" dial is in virtually flawless condition, showing no notable element of age or cracking. The tritium lume plots have taken on a lovely creamy patina with no degradation present when inspected under U.V. light. The original tritium sword hands match the dial perfectly and exhibit no degradation when inspected under U.V. light.


None. The watch has been recently serviced and is running perfectly, backed by a 1-year warranty on accurate timekeeping.