Longines 12.68Z-401, Winding stem

• New Longines original winding stem.

• Thread: 1.20 mm.
  

• Fits: 12.68Z, 12.68N

Versions:

• 12.68Z:     sub second, H=4,25 mm.
• 12.68N:    sweep second, H=5,45 mm.
• 12.68Z:     Quantieme, calendar, sub second, H=5,10 mm.
• 12.68Z:     Stopseconde, "chronograph", H=6,10 mm.

Each version with flat or Breguet hairspring, no shock protection, shock resist or incabloc.