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Illinois Grade 274 Pocket Watch Identification & Technical Specs
Guild Home > Archive > Illinois Grade 274 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 Illinois Grade 274 DIAMETER: 42.4 mm | JEWELS: 21 Jewels | FREQ: 18,000 BPH ARCHIVE SPEC
Original Horological Blueprint • American Watchmaker Illinois Grade 274 Movement Architecture

Technical Specifications & Factory Archival Records

Grade / ReferenceGrade 274
Movement Size16s
Jewel Count17 Jewels
Railroad CertificationStandard Grade (Non-Railroad)
Vibrations Per Hour18,000 BPH (2.5 Hz)
Balance Lift Angle52°
Power Reserve37 hours
Escapement TypeDouble roller lever escapement
Balance Wheel ConstructionMonometallic balance
Hairspring SpecificationBlued steel Breguet spring
Shock Protection SystemNone (Solid jewel settings)

Horological Architecture & Collector Notes

The American Grade 274 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. For examples of restored and converted specimens, see Pocket Watch Conversion Service at AntiqueWrist.

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