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Waltham P.S. Bartlett Pocket Watch Identification & Technical Specs
Guild Home > Archive > Waltham P.S. Bartlett Pocket Watch Identification & Technical Specs

Serial Number & Production Dating Lookup

Enter the 5 to 8 digit serial number stamped directly on the movement plate (not the watch case):

AMERICAN WATCHMAKER • American Watchmaker Waltham Ps Bartlett DIAMETER: 42.4 mm | JEWELS: 21 Jewels | FREQ: 18,000 BPH ARCHIVE SPEC
Original Horological Blueprint • American Watchmaker Waltham Ps Bartlett Movement Architecture

Technical Specifications & Factory Archival Records

Grade / ReferenceP.S. Bartlett
Movement Size18s
Jewel Count17 Jewels
Railroad Certification✓ Certified Railroad Grade
Vibrations Per Hour18,000 BPH (2.5 Hz)
Balance Lift Angle50°
Power Reserve36 hours
Escapement TypeDouble roller lever escapement
Balance Wheel ConstructionMonometallic balance
Hairspring SpecificationBreguet overcoil hairspring
Shock Protection SystemRigid balance jewels

Horological Architecture & Collector Notes

The American P.S. Bartlett was engineered to meet rigorous American horological standards during the turn of the 20th century. Utilizing high-grade alloy components, a precision Double roller lever escapement, 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.

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