4 1/4 x 9”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• According to Seiko datasheets the 1520B should ja 23 jewels, and the 1520A 17 jewels. The movement shown here is marked with 1520B and 17 jewels!
• Movement family:
  • Seiko 15A: 21 jewels
  • Seiko 1520A: 17 jewels
  • Seiko 1520B: 23 jewels

• Listing ID: 10209
• Manufacturer / Brand: Seiko
• Caliber: 1520B
• Size in French Lignes: 4 1/4 x 9'''
• 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: 17
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Shock Protection: Seiko Diashock
• Beats per hour: 19,800
• Balance Type: Glucydur
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1972
• Country: Japan
• Identification: Movement marked with SEIKO 1520B. Original datasheet available. Listed in the Flume K3 catalog from 1972.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)