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.