10 1/2 x 11 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Movement family:
  • Gruen 405: 17 jewels, small seconds
  • Gruen 405SS: 17 jewels, indirect sweeping seconds
  • Gruen 406: 15 jewels, small seconds
  • Gruen 406SS: 15 jewels, indirect sweeping seconds
  • Gruen 425: 17 jewels, small seconds, differences to 405 not known
  • Gruen 425SS: 17 jewels, indirect sweeping seconds, differences to 405SS not known
  • Gruen 426: 15 jewels, small seconds, differences to 406 not known

• Listing ID: 8047
• Manufacturer / Brand: Gruen
• Caliber: 405
• Size in French Lignes: 10 1/2 x 11 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance with Breguet hairspring
• Power Reserve: Approx. 44 hours
• Production Period: Unknown, probably around 1946
• Identification: Movement marked with GRUEN WATCH and 405. Listed in the Swartchild catalog from 1946.
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)