ETA 2451-401, Winding stem

• ETA original winding stem, not in factory packaging.
  

• Thread: 0.90 mm.
  

• Fits cal: 2451, 2452, 2453, 2454, 2460, 2472, 2474

Versions:

• 2390: 10.5''' manual wind.
• 2391: 11.5''' manual wind.
• 2406: 11.5''' manual wind, date.
• 2408: 11.5''' manual wind, new date mechanism.
• 2450: 10.5''' automatic. Base caliber.
• 2451: 11.5''' automatic.
• 2452: 11.5''' automatic, date.
• 2453: 11.5''' automatic, new oscillating weight*
• 2454: 11.5''' automatic, date, new oscillating weight*
• 2456: 10.5''' automatic, date.
• 2471: 11.5''' automatic, date, modified for new date mechanism.
• 2472: 11.5''' automatic, new date mechanism.
• 2474: 11.5''' automatic, date.
• 2475: 11.5''' automatic, date.

*single metal rotor.