6 3/4 x 8”’ | Hand Wind | Swiss Lever | Indirect Sweeping Seconds |

Remarks:

• Movement generations:
  • Seiko 2104A: fixed hairspring-stud holder
  • Seiko 2104B: mobile hairspring-stud holder

• Listing ID: 4276
• Manufacturer / Brand: Seiko
• Caliber: 2104B
• Size in French Lignes: 6 3/4 x 8'''
• Size range mm largest diameter: 0 - 22 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Shock Protection: Seiko Diashock
• Beats per hour: 19,800
• Balance Type: Unknown, probably Glucydur
• Power Reserve: Unknown
• Production Period: Unknown
• Country: Japan
• Identification: Wheel train bridge marked with SEIKO and 2104B. Original datasheet available.
• Contributor ©: Uhrforum.de member malikka
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-13#post-2410414