⚙️ Convert This Pocket Watch Movement into a Custom Wristwatch
Have an authentic vintage Grade 345 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):
Original Horological Blueprint • American Watchmaker Elgin Grade 345 Movement Architecture
Technical Specifications & Factory Archival Records
Grade / Reference
Grade 345
Movement Size
16s
Jewel Count
17 Jewels
Railroad Certification
Standard Grade (Non-Railroad)
Vibrations Per Hour
18,000 BPH (2.5 Hz)
Balance Lift Angle
51°
Power Reserve
36 hours
Escapement Type
Safety pinion lever
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 Grade 345 was engineered to meet rigorous American horological standards during the turn of the 20th century. Utilizing high-grade alloy components, a precision Safety pinion lever, and 17 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.
