Omega 285
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- Serial no: 17 320 108 (1961).
Data: Omega 285 (30 SC T5 PC AM 17 p).
- 17 Jewels, manual winding, center second.
- Size: 30.0 mm.
- H: = 5.10 mm.
- N: = 18 000 A/h.
- Power reserve: 43 h.
Versions with sub second:
- 30: 15 jewels, bi-metallic compensation balance no shock protection (1939).
- 30T1: 15 jewels, bi-metallic compensation balance, no shock protection (1941).
- 30T2: 15 jewels, bi metallic compensation balance, no shock protection (1941).
- 30T2PC: 15 jewels, incabloc, monometallic balance (1941).
- 30T2RG: 17 jewels, chronometre, no shock protection (1943).
- 260: = 30T2PC from 1949, rose gold plated movement (1943).
- 261: 17 jewels, antimagnetic (1943).
- 262: = 30T2RG from 1949 (1943).
- 265: 15 jewels, antimagnetic (1949).
- 266: 17 jewels, antimagnetic (1950).
- 267: 17 jewels, antimagnetic, bewelled main plate (1957).
- 268: 17 jewels, antimagnetic, ring balance, Breguet hairspring (1960).
- 269: 17 jewels, antimagnetic, ring balance, flat hairspring (1963).
Versions with center second:
- 30SC: 16 jewels, bi-metallic comp. balance, no shock protection, c-sec (1941).
- 30SCT1: 16 jewels, bi-metallic comp. balance, no shock protection, c-sec (1941).30SCT2: 16 jewels, bi-metallic comp. balance, no shock protection, c- sec (1941).
- 30SCT2PC: 17 jewels, incabloc, monometallic balance (1943).
- 30SCT2RG: 17 jewels, chronometre, no shock protection (1947).
- 280: = 30SCT2PC from 1949.
- 281: = 30SCT2RG from 1949.
- 283: 17 jewels, antimagnetic (1950).
- 284: 17 jewels, antimagnetic, bewelled main plate (1957).
- 285: 17 jewels, ring balance, Breguet hairspring (1960).
- 286: 17 jewels, ring balance, flat hairspring (1963).
