Very rare stopwatch with jumping 1/4-second, Switzerland for USA around 1880, key winding, smooth coin silver-case with gold-hinges, in cover marked G.W.P., partial engine-turned cuvette, start/stop by pusher at 23 second, two-piece construction enamel dial with Arabic numerals, blued steel hands, gold-plated lever movement with stop-function by intermediate wheel, big compensation-balance, 15 jewels, diameter approx. 52 mm, condition 2