12”’ | Hand Wind | Pin Lever | Sweeping Seconds | Pseudo -Chronograph |

Remarks:

• Pillar construction
• When stopping, the balance and thus the entire movement is stopped
• Pseudo Chronograph with two pseudo totalizors
• The pseudo-totalizer at 9 H is driven by the hour wheel and rotates counterclockwise in a circle every four hours -> completely useless!
• The pseudo-totalizer at 3 H is also driven by the hour wheel and rotates counterclockwise every seven hours -> also completely useless!
• The movement is also available under the same designation without a pseudo-chrono, optionally with a date and with only one totalizer (at 9 H)
• “CAL OC 120” is often written on the case back of watches with ORA OC 71. Differences between OC 120 and OC 71 not known.
• There were small modifications to these movements, but these can probably be found in the OC 71 and OC 120.
  • Modified setting lever spring
  • Area around winding stem: made of metal or plastic
  • Dial side: U-shaped cut-out for anchor or no cut-out
  • Balance cock with two curved and one straight side, balance cock with one curved and two straight sides

• Listing ID: 2101
• Manufacturer / Brand: ORA
• Caliber: OC 71
• Size in French Lignes: 12'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Pin Lever
• Date, Day, Month...: None
• Other Functions: Chronograph
• Jewels: 0
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Unknown
• Production Period: Unknow, probably around 1975
• Country: Italy
• Identification: Marked OC 71 next to the balance
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-42#post-5484849