5 1/2 x 7”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• Movement family:
  • Gruen 280: 17 jewels, capped escape wheel with conical pivots
  • Gruen 540: 17 jewels, differences to 280 not known
  • Gruen 541: 15 jewels, straight escape wheel pivots

• Listing ID: 17908
• Manufacturer / Brand: Gruen
• Caliber: 280
• Size in French Lignes: 5 1/2 x 7''' (5 3/4 x 6 3/4''' according to manufacturer)
• 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°)
• Holes in setting lever spring or rocking bar: 3
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance with Breguet hairspring
• Power Reserve: Unknown
• Production Period: 1936+
• Country: Switzerland
• Identification: Movement marked with GRUEN on the wheel train bridge, and with 280 under the balance wheel.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)