LONGINES CRONOGRAFO OVERSIZE REF. 5966 IN ORO, 1957 CIRCA

LONGINES OVERSIZE CHRONOGRAPH REF. 5966 IN GOLD, CIRCA 1957
Case: signed, n. 5966 17 50, three-body in 18K gold, snap on caseback, claw lugs, rectangular pushers.
Bracelet/Strap: not original.
Dial: signed, silvered, applied triangular indexes and arabic numerals, minute divisions and 1/5th of seconds fraction, subsidiary dials for seconds and 30-min register, red telemetric and blue tachymeter graduations, alpha hands.
Movement: signed, manual-winding cal. 30CH, n. 9743040, 18 jewels, nickel-plated, côtes de Genève, column wheel, monometallic balance with screws, Breguet hairspring, Parechoc shock-absorber.
Accessories: Longines Extract from the Archives confirming the invoicing to Ostersetzer, agent for Italy.
Diameter Ø: 37.5 mm
Note: working.

The 30CH caliber with fly-back function, still considered today one of the best chronograph movements, was made by Longines in 1947 as heir to the famous 13ZN. This watch features a 37.5mm case and the shape recall the latest 13ZN models from the 1940s.