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The Encyclopedia of Horology

Calibre database

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Specifications

FieldHamilton 992B
Makerhamilton
CountryUnited States
Period1940 – 1969
Diameter16 size (approx. 43.1 mm)
HeightApprox. 5.8 mm
Jewels21
Frequency18,000 vph (2.5 Hz)
Power reserveApprox. 40 hours
WindingStem wind (pendant set variants exist)
SettingLever set
EscapementSwiss lever, exposed pallets
BalanceElinvar Extra hairspring with monometallic balance
ComplicationsSubsidiary seconds
ArchitectureThree-quarter plate nickel movement with damascened finish, motor barrel and micrometric regulator; designed specifically to satisfy railway time-service requirements.