ZENITH 30.5-401, Winding stem

• ZENITH original stem, not in factory packaging.
  

• Thread: 0.90 mm.

• Fits: 30.5
  

Manufactured from 1973 - 1979

Data ZENITH cal: 30.5  (OMEGA 625)

• 17 jewels, manual wind.
• Size: 17.5 mm.
• H: = 2.5 mm.
• N: = 21.600 A/h.
• Power reserve: 42 h.
• Mainspring: 1.00 x 6.5 - 0.075