Wristwatch: extremely rare Longines chronograph with central counter

Ca. Ø39.5mm, steel, case back bearing reference number 23021 and year 47, serial number 7085353, hand-wound Calibre 13ZN, original silvered dial with original radioactive luminous material, central red minute hand, 12-hour counter, luminous hands, leather strap as good as new, in working order, extremely rare in steel.

Estimate:-

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