Rolex Chronograph 2508

ROLEX REF. 2508, CHRONOGRAPH, MINUTE COUNTER BLACK LACQUERED DIAL SO-CALLED "DUCO" WITH ARCHIMEDEAN SPIRAL SCALE; 18K YELLOW GOLD | Important Modern & Vintage Timepieces | Monaco Auction

ROLEXREF. 2508, CHRONOGRAPH, MINUTE COUNTER BLACK LACQUERED DIAL SO-CALLED "DUCO" WITH ARCHIMEDEAN SPIRAL SCALE; 18K YELLOW GOLD, Very fine and extremely rare and well preserved, 18K yellow gold, manual-winding, "tonneau"-shaped, large gentleman’s wristwatch, snap-on case-back, black colour lacquered dial, so-called "Duco", with subsidiary seconds at 9, chronograph with telemetric scale graduated on the dial for one kilometre and tachometric scale graduated in an Archimedean spiral for 400 units, and 30-minute counter.Brand Rolex, Geneva Reference 2508 Year circa 1936 Case No. 37 130 Material 18K yellow gold Bracelet black leather strap Buckle gilded metal buckle Diameter 37 mm. Caliber 13''' (based on Valjoux 23 by Reymond Frères, Les Bioux, Vallée de Joux) Weight 41.1 gr (approx.) Signature dial, case and movement