An antique silver and tortoiseshell pair case verge calendar watch, the movement signed Io. Leo. Boumel, Nurnberg, with spreading foliate pillars, the silver dial with Roman numerals, the gilt centre with date aperture scroll work decoration and signature Bommel, the case engraved with astrological sectors, various defects, with shuttered winding aperture, the outer case tortoiseshell veneered, suspended from a chain link fob with central panel depicting a sailing ship.