LONGINES MULTISCALE CHRONOGRAPH YELLOW GOLD
Longines, "Chronographe", No. 3957896. Made circa 1910.
Fine and rare, keyless, 18K yellow gold pocket watch with chronograph,
instantaneous 30-minute register, tachometer and telemeter.
Four-body, "demi-bassine", solid, polished, the back cover with an
engraved coat of arms, co-axial button in the crown for the start/stop
and return-to-zero functions of the chronograph. Hinged gold cuvette
engraved with the Longines " 7 Grand Prix" medals.
White enamel with Breguet numerals, outer Arabic minute and chronograph
seconds divisions, outermost tachometer and telemeter graduation
to 1000 m., sunk subsidiary dials for the seconds and the 30-minute
register. Blued steel Breguet hands.
Cal. 19.73N, matte gilt, 18 jewels, straight line lever escapement,
monometallic balance with screws, self-compensating Breguet balance
spring, cam micrometer regulator, visible chronograph mechanism.