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Waltham Colonial Pocket Watch Identification & Technical Specs
Guild Home > Archive > Waltham Colonial 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 Colonial DIAMETER: 42.4 mm | JEWELS: 21 Jewels | FREQ: 18,000 BPH ARCHIVE SPEC
Original Horological Blueprint • American Watchmaker Waltham Colonial Movement Architecture

Technical Specifications & Factory Archival Records

Grade / ReferenceColonial
Movement Size10s
Jewel Count19 Jewels
Railroad CertificationStandard Grade (Non-Railroad)
Vibrations Per Hour18,000 BPH (2.5 Hz)
Balance Lift Angle50°
Power Reserve37 hours
Escapement TypeSafety pinion lever
Balance Wheel ConstructionMonometallic balance
Hairspring SpecificationBreguet overcoil hairspring
Shock Protection SystemRigid balance jewels

Horological Architecture & Collector Notes

The American Colonial 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 19 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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