With original fitted brown leather presentation box and a male key.
A similar "snake" bracelet with cherub's head on the hinged cover is prominently illustrated in Armbanduhren - 100 Jahre Entwicklungsgeschichte by Kahlert, Mühe, Brunner, fifth edition, pp. 26 & 27, pl. 38, and in Museums of Horology La Chaux-de-Fonds, le Locle, p. 118.
Louis Duchêne & Fils were active in Geneva between around 1790 and 1820. The firm specialized in enamelled and fantasy watches.