Longines 505-401, Winding stem

• LONGINES original stem, not in factory packaging.

• Thread: 0.90 mm.
  

• Fits cal: 505, 506, 507, 508

Versions: 19800 A/h:

• 501: date.
• 503: day, date.
• 505: quickset date.
• 507: day, quickset date.

Versions: 21600 A/h, micrometer regulator:

• 506: quickset date.
• 508: day, quickset date.