Zenith 2511-401, Winding stem

• ZENITH original winding stem, not in factory packaging.

• Thread: 0.90 mm.
  

• Fits cal: 2511, 2522, 2530, 2531, 2532, 2540, 2541, 2542, 2552, 2562, 2572 (P, C, PC).

Versions with 18000 A/h.

• 2510: 18 jewels, manual wind, no second.
• 2511: 18 jewels, manual wind, sub second.
• 2522: 17 jewels, manual wind, center second.
• 2522C: 17 jewels, manual wind, center second, date.
• 2522P: 17/28 jewels, automatic, center second.
• 2522PC: 17/28 jewels, automatic, center second, date.

Versions with 21600 A/h and exentric regulator.

• 2530: 19 jewels, manual wind, no second.
• 2531: 19 jewels, manual wind, sub second.
• 2532: 19 jewels, manual wind, center second.
• 2532C: 19 jewels, manual wind, center second, date.
• 2532P: 30 jewels, automatic, center second.
• 2532PC: 30 jewels, automatic, center second, date.
• 2540: 17 jewels, manual wind, no second.
• 2541: 17 jewels, manual wind, sub second.
• 2542: 17 jewels, manual wind, center second.
• 2542C: 17 jewels, manual wind, center second, date.
• 2542P: 25 jewels, automatic, center second.
• 2542PC: 25 jewels, automatic, center second, date.
• 2552C: 17 jewles, manual wind, center second, date.
• 2552P: 17/23 jewels, automatic, center second.
• 2552PC: 17/23 jewels, automatic, center seond, date.

Versions with 28800 A/h and exentric regulator.

• 2562: 17 jewels, manual wind, center second.
• 2562C: 17 jewels, manual wind, center second, date.
• 2562P: 23 jewels, automatic, center second.
• 2562PC: 23 jewels, automatic, center second, date.

Versions with 28800 A/h and micrometer regulator (1975-78).

• 2572: 17 jewels, manual wind, center second.
• 2572C: 17 jewels, manual wind, center second, date.
• 2572P: 17/23 jewels, automatic, center second.
• 2572PC: 17/23 jewels, automatic, center second, date.