Swiss pocket watch with rare second zero reset device Circa 1902

Silver open faced pocket watch by International Watch Co.
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A Swiss Schaffhausen gentleman’s pocket watch with a rare second zero reset device, circa 1902.
White enamel dial with radial Roman numerals, outer minutes track, subsidiary dial for the seconds, and spade hands. Engine-turned silver case with cartouche. 1/2 plate movement, screw compensation balance.
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Diameter: 51 mm
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Weight: 103 g
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Signed: International Watch Co.
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This is a very unusual IWC pocket watch. The zero setting function is activated by a coaxial pusher in the winding crown and an elaborate set of levers transmits the force to the auxiliary seconds. We do not know if this mechanism was designed by IWC or if it was added to the movement at a later date by a keen watchmaker.