Very fine and rare, 18K yellow gold single chronograph wristwatch with snap-on case back and hinged gold cuvette engraved with: "Chronographe -Compteur Longines, 10 Grands Prix". The white enamel dial with painted black Arabic numerals, inner minutes/ seconds track with every five Arabic markers in red, subsidiary dial for the seconds and 30-minute register, inner tachometer scale in red and outermost blue telemeter scale. Blued steel Breguet hands.

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