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.