Stainless Swiss centre seconds lever deck watch Circa 1930

Center seconds deck watch by Longines
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A Swiss centre seconds lever deck watch with British military markings in a stainless steel open-faced case, circa 1930. Keyless 16 jewel gilt bar movement marked with the Ministry of Defence broad arrow, going barrel. Plain cock with polished steel regulator, compensation balance with blue steel overcoil hairspring. Club foot lever escapement. Signed and numbered white enamel dial with centre seconds, Arabic numerals, and blue steel hands. Plain stainless steel open-faced cased with screw bezel and back marked ‘Acier Inox – Staybrite’.
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Diameter: 52 mm
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Signed: Longines