This unique chronograph is appreciated and sought after by collectors for the characteristics of the movement and the care given to details : the finish of the case-back, the engraving of the driver’s signature, the reproduction in relief on the dial of the great «Nivola’s» tortoise charm. Automatic chronograph movement with fly-back mechanism to read an intermediate time or a double timing. Case in steel with back fixed by 8 screws, antireflection convex sapphire glass. Pearled bezel with engraved tachymetric scale graduated in miles/hour. Black dial.