IWC rare open face silver-pocket watch calibre 28, Switzerland around 1890, engine-turned & partiell-gold plated case abraded, enamel dial with Roman numerals damaged, blued steel hands, constant second at 6, gold plated 2/3- board-movement, 15 jewels, 3 screwed chatons, engraved escape wheel- and balance cock, compensation-balance with Breguet hairspring, diameter approx. 51,5 mm, condition 2-3