Omega 30 SC T2 PC (280)
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The sweep second version of the Omega 30T2PC was introduced in 1943 as caliber 30 SC T2 PC AM 17p or caliber 280 as they was renamed in 1949.
Example movement: Number: 10 506 626, manufactured in 1943, signed on the plate: 30 T2 SC PC.
Note 1, Engraved on the train wheel bridge: 17 jewels as it should but there is only 16 jewels in this movement as it lacks the jewel for centre wheel, upper, part no: 4013.
Note 2, The sweep second cock is different on the caliber 280 compared to cal: 283, 284, 285 and 286, the part number is listed as the same: 280-1007 but the later will not fit the 280 movement.
Technical data: Omega 280 (30 SC T2 PC AM 17 p).
- 15 jewels, manual wind, sub second.
- S: = 30.00 mm.
- H: = 5.10 mm.
- N: = 18.000 A/h.
- Power reserve: 43 h.
- Mainspring:
Versions with sub second:
- 30: 15 jewels, bi-metallic compensation balance no shock protection.
- 30T1: 15 jewels, bi-metallic compensation balance, no shock protection.
- 30T2: 15 jewels, bi metallic compensation balance, no shock protection.
- 30T2PC: 15 jewels, incabloc, monometallic balance.
- 30T2RG: 17 jewels, chronometre, no shock protection.
- 260: = 30T2PC from 1949, rose gold plated movement.
- 261: 17 jewels, antimagnetic.
- 262: = 30T2RG from 1949.
- 265: 15 jewels, antimagnetic.
- 266: 17 jewels, antimagnetic.
- 267: 17 jewels, antimagnetic, bewelled main plate.
- 268: 17 jewels, antimagnetic, ring balance, Breguet hairspring.
- 269: 17 jewels, antimagnetic, ring balance, flat hairspring.
Versions with center second:
- 30SC: 16 jewels, bi-metallic comp. balance, no shock protection, c-sec.
- 30SCT1: 16 jewels, bi-metallic comp. balance, no shock protection, c-sec.
- 30SCT2: 16 jewels, bi-metallic comp. balance, no shock protection, c- sec.
- 30SCT2PC: 17 jewels, incabloc, monometallic balance.
- 30SCT2RG: 17 jewels, chronometre, no shock protection.
- 280: = 30SCT2PC from 1949.
- 281: = 30SCT2RG from 1949.
- 283: 17 jewels, antimagnetic.
- 284: 17 jewels, antimagnetic, bewelled main plate.
- 285: 17 jewels, ring balance, Breguet hairspring.
- 286: 17 jewels, ring balance, flat hairspring.
