Thomas Mercer Ltd., St. Albans, England, break circuit chronometer with mechanism for sending a signal at one minute intervals, 14 jewel, two day fusee movement with Z balance, and spring detent escapement, an auxiliary wheel mounted to the the fourth

Thomas Mercer Ltd., St. Albans, England, break circuit chronometer with mechanism for sending a signal at one minute intervals, 14 jewel, two day fusee movement with Z balance, and spring detent escapement, an auxiliary wheel mounted to the the fourth wheel arbor closing a pair of contacts for one second every minute, mounted to an aluminum plate, and contained in an aluminum canister silvered dial showing seconds on the outer ring, with subsidiary 24 hour chapter, blued steel hands, all contained in a fabric covered, wooden box with screw terminals, serial # 20914, mid 20th century movement tarnished, dirty and very oily, circuitry appears to be complete, dial with minor tarnish, hands good, running, one movement mounting screw missing, cover for aluminum canister missing, box with staining