Seamaster PloProf 166.077
1971–19797 variants
Seamaster 600 “Plongeur Professionnel”, developed with COMEX for saturation diving. Monobloc case loaded through the front so helium cannot enter (no escape valve), crown on the left behind a locking nut, and a bi-directional bezel that turns only while the red button is pressed. Made of “Uranus” (904L-type) steel; caliber 1002. Rated 600 m but tested to 1,000 m and shown to survive about 1,370 m.
HODINKEE notes that over 60% of PloProfs serviced at Omega in Bienne had swapped movements, and that service dials, hands and bezels are common.
Variants over time
All recorded years
19651979
1965197019751980
Faded ends mark approximate or unknown dates. Years are as stated by the cited sources.
Reference specifications
- Brand
- Omega
- Model
- Seamaster PloProf
- Reference
- 166.077
- Production
- 1971–1979
- Case material
- Stainless steel
- Case size
- 45 × 54 mm
- Water resistance
- 600 m
- Date
- Yes
More specifications (3)
- Crystal
- Chemically hardened mineral glass
- Movement
- Automatic
Read more
- In-Depth: Getting To The Bottom Of The Omega PloprofRead more at HODINKEE (opens in a new tab)
- The legendary Omega Seamaster Ploprof – The Kraken of Diving WatchesRead more at Monochrome Watches (opens in a new tab)
- Omega and the PloProf Research Programme – Innovation in Professional Dive WatchesRead more at Monochrome Watches (opens in a new tab)