Paul Ditisheim, La Chaux de Fonds, a rare, two day, central second marine chronometer, the 15 jewel gilt movement with crosshatched plates, lever escapement, Guillaume balance, and unusual keyless winding and setting mechanism, the escapement components contained in their own module, and removable, like a platform escapement, while leaving the rest of the movement intact, the signed, silvered dial with wind indicator at top, the hour and minute chapter below the central seconds hand, contained in a brass bowl mounted in gimbals, all within a mahogany box with brass furniture, and engraved plate on front, serial #1012