Longines. A very rare set of two stainless steel openface keyless lever navigation watches with up and down indicators, timed to Civil Time and to Greenwich Sidereal Time

SIGNED LONGINES, NO. 5003801, GREENWICH SIDEREAL TIME, AND LONGINES, NO. 5003802, CIVIL TIME, CIRCA 1925

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Longines. A very rare set of two stainless steel openface keyless lever navigation watches with up and down indicators, timed to Civil Time and to Greenwich Sidereal Time
Signed Longines, No. 5003801, Greenwich Sidereal Time, and Longines, no. 5003802, Civil Time, circa 1925
Both cal. 24.99 nickel-finished lever movements, 17 jewels, bimetallic compensation balances, cam wheel regulator, the silvered matte dials with black and red Arabic 24 hours indications, blued steel spade hands, subsidiary seconds, fan-shaped 50 hours power reserve indicators, in large circular cases with snap on backs, large ball-shaped crowns, balance stop/start levers in the band, both cases, dials and movements signed
76 mm. diams. (2)

Lot Essay

Accompanied by fitted walnut box with sliding cover to the glazed top.
These deck watches were used by the US Navy and Air Force for navigational purposes. It is exceedingly rare to find a set of such navigation watches with consecutive numbers.

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