Westclox A-331-1 = Seiko 7005A

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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 in French Lignes: 12'''
  • Shape: Round
  • Winding: Automatic
  • Hands Setting: Crown
  • Seconds Hand: Sweeping seconds (central seconds)
  • Escapement: Lever (Swiss, English, Glashütte)
  • Date, Day, Month...: 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

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