Heuer 11-5420, Screw for crown wheel core

• HEUER original part in very good used condition.

• Left thread.
  

• Fits Heuer cal: 11, 12, 14, 15 (base caliber: Buren 1281).

Versions:

• 11: N: = 19800.
• 12: N: = 21600.
• 14: as cal: 12 with 24h GMT.
• 15: as cal: 12, sub second instead of 12 h counter.