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Elgin Grade 571 Pocket Watch Identification & Technical Specs
Guild Home > Archive > Elgin Grade 571 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 Elgin Grade 571 DIAMETER: 42.4 mm | JEWELS: 21 Jewels | FREQ: 18,000 BPH ARCHIVE SPEC
Original Horological Blueprint • American Watchmaker Elgin Grade 571 Movement Architecture

Technical Specifications & Factory Archival Records

Grade / ReferenceGrade 571
Movement Size16s
Jewel Count21 Jewels
Railroad Certification✓ Certified Railroad Grade
Vibrations Per Hour18,000 BPH (2.5 Hz)
Balance Lift Angle52°
Power Reserve37 hours
Escapement TypeDouble roller lever escapement
Balance Wheel ConstructionMonometallic balance
Hairspring SpecificationBreguet overcoil hairspring
Shock Protection SystemNone (Solid jewel settings)

Horological Architecture & Collector Notes

The American Grade 571 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 21 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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