Swiss "Jump Hour" pocket watch. Model dating from approximately 1900–1910. Swiss-made (inscribed on the hour disc, located beneath the case). One of the earliest "Jump Hour" pocket watch models. Diameter: 50 mm. Height (including the bow/attachment loop): 68 mm. Weight: 66.5 g. PLEASE NOTE – In its current position, the crown is used to wind the watch; to set the time, push the crown in. Once pushed in, you can adjust the time. You do not need to keep pushing it; it will return to the winding position on its own. The time-setting mechanism differs from that of modern watches. Beautiful and very RARE, especially considering its condition (though not perfect). Serviced by a professional watchmaker. Looks and functions very well for its age. I am not a professional photographer, but I hope the photos speak for themselves. The item will be shipped with a tracking number.