Omega
Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 227.90.55.21.99.001
The Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 (reference 227.90.55.21.99.001) is a 55 mm titanium watch with a grey dial. It runs on the automatic caliber 8912 with a 60-hour power reserve and is water resistant to 1200 m. It was introduced in 2015.
Specifications
Case
- Reference
- 227.90.55.21.99.001
- Collection
- Seamaster Ploprof
- Case size
- 55 mm
- Case material
- Titanium
- Case shape
- Other
- Crystal
- Sapphire
- Water resistance
- 1200 m
- Bracelet / strap
- Titanium bracelet
Dial and bezel
- Dial
- Grey
- Bezel
- Rotating dive bezel
Movement
- Movement
- Automatic
- Caliber
- 8912
- Power reserve
- 60 hours
- Frequency
- 25,200 vph
- Jewels
- 39
- Functions
- Time only, Dive bezel
Production
- Production
- 2015 – today
How it compares within the Seamaster Ploprof family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| 227.90.55.21.99.001 (This watch) | 55 mm | Titanium | Grey | 8912 | 2015– |
| 166.077 | — | Stainless steel | — | — | 1970– |
| 224.30.55.21.01.001 | 55 mm | Stainless steel | Black | 8500 | 2009– |
| 224.30.55.21.04.001 | — | Stainless steel | White | — | — |
| 224.32.55.21.04.001 | — | Stainless steel | White | — | — |
| 227.32.55.21.03.001 | — | O-mega Steel | Summer Blue | — | — |
| 227.90.55.21.01.001 | — | Titanium | Black | — | — |
| 227.90.55.21.04.001 | — | Titanium | White | — | — |
| ST166.0077 | — | Stainless steel | — | 1002 | 1970–1979 |
About the Seamaster Ploprof family
The Ploprof, short for Plongeur Professionnel, was introduced in 1970 for professional divers. Its large monobloc case, with no removable caseback, was rated to 600 metres, and the bezel is unlocked with a red push-button so it cannot be moved by accident.
Omega reissued the design in 2009 as the Ploprof 1200M, and later versions in titanium use Master Chronometer calibers. The catalog includes vintage refs. such as 166.077 and modern references in steel and titanium. Dealers check the bezel lock, the condition of the mesh bracelet or strap and, on vintage pieces, the originality of the dial and hands.
Quick answers
- What size is the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 227.90.55.21.99.001?
- The Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 227.90.55.21.99.001 has a 55 mm case.
- What movement does the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 227.90.55.21.99.001 use?
- It uses the automatic caliber 8912, with a 60-hour power reserve.
- How water resistant is the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 227.90.55.21.99.001?
- It is water resistant to 1200 metres.
- When did the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 227.90.55.21.99.001 come out?
- It was introduced in 2015.
- What is the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55x48 227.90.55.21.99.001 made of?
- The case is titanium. Bracelet or strap: Titanium bracelet.
Catalog facts checked September 2026.