
Wristwatches · Wristwatch
Omega Seamaster 120 (Ref. 166.073) Black, 1971
- Maker / attribution
- Omega (maker)
- Date
- 1971
- Historical period
- Quartz Revolution (1969 – 1990)
- Country of origin
- Switzerland
- Object type
- Wristwatch
- Stock no.
- OMSM120BLK
- Credit line
- Dealer listing, Craft & Tailored (OMSM120BLK)
- Catalogue title (original)
- 1971 Omega Seamaster 120 (Ref. 166.073) Black (English)
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Record summary
Catalogued by Craft & Tailored (dealer), Los Angeles (stock number OMSM120BLK), this is a wristwatch by Omega, made in Switzerland, dated 1971. The Atlas places it in the Quartz Revolution period (1969 – 1990) of its Wristwatches collection. The record is illustrated with 6 photographs.
Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.
Catalogue description
Dealer description — Craft & Tailored
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 dating 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 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 120 from other dive watches of the era is the 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 ref. 166.073 is certainly an uncommon timepiece. Though it was produced in two colorways, the best known being the "Deep Blue" variation, it is known within the collector community that the black dial variants, like the one presented here, are the rarer of the two. Stock # OMSM120BLK Brand Omega Style Seamaster 120 Model 166.073 Serial 33XXXXXX Size Men's Material Stainless Steel Dial Matte Black Millimeters 42.5 Strap Single-Pass Nylon Strap W/ Velcro Closure CASE & BRACELET The beautiful and robust case displays evidence of light previous polishing and features impressive dimensions throughout the extremely broad lugs. The original black bakelite bezel is in excellent overall condition and features two light cracks which is a very common feature for bakelite bezels in this era, the lume within the bezel has achieved a beautiful creamy patina that matches the dial patina nicely. The case retains its original Omega signed screw-down crown, which also operated the quick-set date function. The case back features the original Seamaster medallion in excellent overall condition. The watch comes supplied on a single-pass nylon strap with a velcro closure. DIAL & HANDS The matte black dial is in wonderful vintage condition with only gentle elements of age present that are invisible to the naked eye. The original tritium lume plots have achieved a stunning golden-yellow patina, under U.V. light inspection some of the lume plots feature subtle cracking though no actual degradation is present. The original sword hands have been professionally restrored with tritium and feature a sandy coloration. ACCESSORIES
Historical context
Quartz Revolution (1969 – 1990)
Seiko's Astron begins mass quartz timekeeping; traditional industries contract sharply.
Quartz and digital watches transformed the market after 1969. Swiss employment collapsed, Japanese and Hong Kong production soared, and the Swatch (1983) helped the Swiss industry recover; mechanical watches survived as luxury goods.
Read the period in the timelineMore wristwatches from this periodEarlier: Modern Mechanical Horology
Atlas type guide
Dive and water-resistant watches
Keeping water and dust out of a wristwatch was a long-standing challenge. Rolex's screw-down Oyster case (1926) and Omega's Marine (1932) were landmarks; in the early 1950s Blancpain's Fifty Fathoms and Rolex's Submariner defined the professional dive watch with rotating bezels for timing dives, luminous dials and high water resistance. The ISO 6425 standard (1982) later codified what a 'diver's watch' must do.
Dive watches became icons of post-war design and exploration, and their evolution — helium escape valves, ceramic bezels, saturation-diving depth ratings — records the history of underwater work.
What to look for
- Unidirectional or bidirectional rotating bezel with minute markings.
- Screw-down crown and case back; depth rating printed on the dial.
- Luminous hands and markers (radium before c. 1960, tritium c. 1960–1998, then Super-LumiNova).
- Reference numbers on the case between the lugs or inside the back.
Dating clues
- Screw-down Oyster cases: from 1926.
- Professional dive watches: from 1953.
- Tritium 'T' marks on dials: c. 1960–1998.
General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.
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