Fleurier, 55 mm, 106 g, circa 1840. A unique pocket watch with spring detent escapement and centre seconds with half seconds jump - for the Chinese market. Silver case, glazed movement, case maker's punch mark "FDB". Enamel dial. Bridge movement, key wind, going barrel, bimetallic chronometer screw balance.

As far as we know this is the only known pocket watch with a precision movement with spring detent escapement that was ever produced for the Chinese market.