5 3/4 x 7 1/2”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• In the Quick Fit catalog from 1961, the GP 73 is one of the very few calibers that is not based on a movement from another manufacturer. It therefore appears to be either an in-house development by GP or an exclusive development for GP
• Swing-out balance guard (covers the hairspring stud-holder)
• Setting lever spring defective

• Listing ID: 4789
• Manufacturer / Brand: Girard-Perregaux
• Caliber: GP 73
• Size in French Lignes: 5 3/4 x 7 1/2'''
• 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: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Screw balance
• Power Reserve: Unknown
• Production Period: Unknown
• Identification: Dial side marked with GP 73. Listed in the Flume K3 catalog, but without illustration.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-6#post-1631739
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)