Jaeger-LeCoultre Geophysical Observatory Q8102520, custom 722 automatic mechanical movement.

Jaeger-LeCoultre Geophysical Observatory Q8102520 male watch. Custom 722 automatic machine, 39.6mm Vibration frequency: 28800 oscillations per hour Number of parts: 275 18k rose gold plated 41.6 mm diameter Case thickness: 11.7 mm Dial color: silver white Dial shape: round Table mirror material: sapphire crystal glass Strap material: cowhide Clasp type: pin buckle Back through: Back through Waterproof depth: 50 meters Function: Date display