Ca. Ø54mm, ca. 87g, silver case No. 2294, case maker's mark IBP, dome inscribed in German Wilhelm Gerwig 1815, magnificent fire-gilt cylinder movement, a very exceptional calibre, plain enamel dial, fine gold Breguet hands, dial professionally restored, intact. Robert Gerwig, born in 1820, was very well known in Germany, 1st director of the Furtwangen watchmaking school and founder of the 1st watch museum in the world.