5 3/4 x 8 1/2”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• Rocking bar winding
• Click on the dial side
• Movement family:
  • Otero 25 old: no date
  • Otero 25 new: no date, different dial side, other differences not known
  • Otero 251: date

• Listing ID: 6718
• Manufacturer / Brand: Otero / Zentra
• Caliber: Otero 25 new = Zentra 732
• Size in French Lignes: 5 3/4 x 8 1/2'''
• Size range mm largest diameter: 0 - 22 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: None
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15, 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: Monorex or none
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1962. Otero 25 old probably around 1952.
• Identification: Dial side marked with Otero logo and 25. Bridge side marked with Zentral logo and 732. Listed as Otero 25 new in the Flume K2 catalog from 1962.
• Country: Germany
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)