Anonymous, Ruby Cylinder movement

Anonymous, probarbly Swiss keywind ruby cylinder lepine caliber movement. With Geneva stopwork, blued steel regulator with bimetallic temperature compensating curb, "parachute" shock protection in polished steel for the upper balance pivot . Manufactured in aprox: 1840

Data:

• 
  11 Jewels, key wind, key set.
• 
  Size: 18''' 40.5 mm.
• 
  H: = 3.95 mm.
• 
  N: = -- A/h.
• 
  Power reserve: -- h.
• 
  Mainspring: