AS 1203-770, Mainspring

• Manufacturer: YTIRE, Corgémont, Switzerland.
  

• Material: Blued, hardened steel.

• Fits cal: 1203, 1207, 1263, 1266, 1267, 1311, 1314

• H: = 1.75
• D: = 9,5
• F: = 0,115
• L: = 340

Data: AS 1203

• 15 jewels, manual wind, sub second.
• Size: 12''' 26.6 mm.
• H: = 3.80 mm.
• N: = 18.000 A/h.
• Power reserve: 40 h.
• Mainspring: 1.75 x 9.5 - 0.115 - 340 mm.