Waltham Serial Number 25000000-30000000 Date & Production Guide
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⚙️ Convert This Pocket Watch Movement into a Custom Wristwatch
Have an authentic vintage mechanism? Our partner master atelier AntiqueWrist specializes in handcrafting solid .925 sterling silver wristwatch cases with welded wire lugs custom-fitted for this exact movement.
Enter the 5 to 8 digit serial number stamped directly on the movement plate (not the watch case):
Official Serial Archive • Waltham Historical Registry Ledger
Technical Specifications & Factory Archival Records
Range
25000000-30000000
Vibrations Per Hour
18,000 BPH (2.5 Hz)
Balance Lift Angle
52°
Power Reserve
39 hours
Escapement Type
Straight line lever escapement
Balance Wheel Construction
Bimetallic compensation balance with gold screws
Hairspring Specification
Blued steel Breguet spring
Shock Protection System
None (Solid jewel settings)
Horological Architecture & Collector Notes
The American pocket watch was engineered to meet rigorous American horological standards during the turn of the 20th century. Utilizing high-grade alloy components, a precision Straight line lever escapement, and 15 jewels with fine ruby endstones, this movement provided exceptional isochronism and positional stability.
Among vintage restorers and conversion specialists, this series is admired for its accessible gear train geometry and solid metallurgy, making surviving specimens excellent candidates for preservation and custom recasing.
