Robert Roskell, MAKER TO THE ADMIRALTY, Liverpool, No 1611/62106 The three tier brass-bound case with glazed lid inset with a vacant brass shaped cartouche, the mid section with ivory button, the lower section with side handles, the signed and numbered silvered 4 inch Roman dial with minute track enclosing subsidiary dials for power reserve and running seconds, with gold hands, all set in a gimballed bowl, the gilt spotted chain movement with maintaining power to the chain fusee, freesprung blued steel helical spring to a heavy bimetallic balance and Earnshaw type spring detent escapement, with tipsy key set to the interior of the case The case 18cms (7ins) wide