Chronometer power reserve and thermometer Circa 1980

A German gold open faced chronometer pocket watch with days of the week, power reserve and thermometer, circa 1980. Type concours observatoire certified chronometer nickel lever movement and 19 jewels. Silvered guilloché regulator dial, polished chapter rings for minutes, hours and days of the week, aperture for up and down indication, fan-form sector for thermometer. 18 Carat engine turned case, bow winding mechanism. Case, dial and movement signed.