12”’ | Automatic | Swiss Lever | Sweeping Seconds | Date |

Remarks:

• Automatic: manual winding not possible
• Date with quick setting
• Ball bearing rotor

 

• Listing ID: 4292
• Manufacturer / Brand: Seiko / Westclox
• Caliber: Westclox A-331-1 = Seiko 7005A
• Size: 12'''
• Shape: Round
• Winding: Automatic
• Hand Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date & Day: Date
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Seiko Diashock
• Beats per hour: 21,600
• Balance Type: Gold-plated Nickel?
• Power Reserve: 43 hours
• Production Period: Unknown, probably around 1975
• Identification: Rotor marked A-331-1. Compared to Seiko 7500A.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-13#post-2398441
• Country: Japan / U. S. A.
• Contributor ©: Uhrforum.de member malikka