Ca. Ø 46 mm, ca. 65 g, 18 K gold, case no.414307, Patek Philippe punch, dome signed Patek Philippe & Co. Geneva No. 816780 sowie Luis Sanz, Joyero, Madrid, very fine precision lever movement with fine adjusting device, moustache lever, wolf's toothing, full signed and numbered, original signed silvered dial with digital jumping hours, central minute hand, subsidiary seconds, very good condition, in working order, with silver Patek Philippe medal. The watch no.820813 also from 1928 was sold in Geneva auction 2007 for 82,600 SwissFrancs (source:http://www.antiquorum.com/catalog/lots/patek-philippe-lot-171-516?browse_all=1&page=1&q=patek+jumping+hour+dress) and the platinum watch no. 199933 was sold in Geneva auction for 226,250 SwissFrancs.