Omega 300 (R 17.8), Winding stem, DCN: 1861
- DCN no: 1861
- Thread: 0.90 mm.
- Fits cal: R 17.8, R 17.8 s, 300, 301, 302, 310, 311
- A: = 63
- B: = -
- C: = 110
- D: = 90
- F: = 314
Versions:
- R17,8: sub second, rhodium plated bridges, to 1949.
- R17,8AM: sub second, antimagnetic, rhodium plated bridges, to 1949.
- R17,8SCAM: center second, antimagnetic, rhodium plated bridges, to 1949.
- 300: same as 17,8, sub second, rose gold plated bridges, from 1949.
- 301: same as 17,8AM, rose gold plating, from 1949.
- 302: sub second, incabloc.
- 310: same as 17,8SC, from 1949.
- 311: same as 17,8SCAM, from 1949.