8 3/4 x 9 3/4”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Movement family:
  • Gruen 430: 17 jewels, plane back surface, capped escape wheel with conical pivots
  • Gruen 431: 15 jewels, plane back surface, straight escape wheel pivots
  • Gruen 435: non-precision version of the 431
  • Gruen 440: 17 jewels, curved back surface, capped escape wheel with conical pivots

• Listing ID: 7692
• Manufacturer / Brand: Gruen
• Caliber: 440 Curvex
• Size in French Lignes: 8 3/4 x 9 3/4'''
• Size range mm largest diameter: 0 - 22 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. 36 hours
• Production Period: 1940 - 1948
• Country: Switzerland
• Identification: Movement marked with GRUEN on the ratchet wheel, and with 440 on the base plate. Listed in the Paulson catalog from 1940.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)