11 1/2”’ | Automatic | Swiss Lever | Direct Sweeping Seconds |

Remarks:

• Automatic with bidirectional winding
• Variants of the movement:
  • old: mainspring barrel with slip spring
  • new: fixed mainspring, friction clutch on pawl wheel
• Movement family:
  • Otero 40: 10 1/2”’, hand winding, no date
  • Otero 41: 11 1/2”’, hand winding, no date
  • Otero 48: 11 1/2”’, automatic, no date
  • Otero 401: 10 1/2”’, hand winding, small date
  • Otero 411: 11 1/2”’, hand winding, small date
  • Otero 412: 11 1/2”’, hand winding, normal date
  • Otero 481: 11 1/2”’, automatic, small date
  • Otero 482: 11 1/2”’, automatic, normal date

• Listing ID: 20745
• Manufacturer / Brand: Otero
• Caliber: Otero 48
• Size in French Lignes: 11 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Automatic
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 25
• Setting Lever Screw/Pin Position: Right
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Monorex
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: 45 hours
• Production Period: Unknown, probably around 1957
• Country: Germany
• Identification: Marked with Otero logo and 48 next to balance. Listed in the Flume K1 catalog in the part from 1957.
• Contributor ©: Anonymous