FHF 28-770, Mainspring

• SWISS MADE generic mainspring for FHF
  

• Fits cal: 28, 28.2, 28.2N, 281, 281.2, 281.2N
  

Technical data: FHF 28

• 17/25 jewels, Manual wind, sweep second.
  
• Size: 10.5''' 23.30 mm.
• H: = 4.55 mm.
• N: = 18.000 A/h.
• Power reserve: 44 h.
• Mainspring: 1.45 x 9.5 - 0105 - 340

Versions:

• 28:        10.5'''
  
• 28.2:    10.5''' date.
• 281:      11.5'''