A. Schild / Ebauches Trust Jump Hour unisex watch Swiss made. Exact year not known, estimate circa 1936 Art Deco Mechanical movement, hand wound. One of the first digital watches based on mechanical movement Gold-plated case has two openings, upper to read the hour, bottom to read minutes At exactly 60 minutes it moves one hour, also for the date, therefore the Jump Hour naming. Caliber A. Schild 624 10 micron gold plated case The movement displays the time correctly and is smoothly wound. Display of hours in perfect condition. Some numbers (minutes) are less clear. Movement is mechanically in very good condition. For details, see elaborate photo series. Size movement 17 x 27 mm excl. crow / 19 x 27 mm incl. crown Length lug - 34 mm Thickness 7 mm Length strap incl. movement 22 cm Delivered in original box, 30s with gold coloured lock Nice collector's item from Art Deco period Will be shipped by registered post.