JONES, GRAY & KEEN No. 223: A 19th Century two-day marine Chronometer Movement and Bowl, the silvered dial signed Jones, Gray & Keen. 25-26 Strand, Liverpool, No. 223 Roman hour chapters, Arabic 5-minute intermarkers, subsidiary seconds and up-and-down dials, gold hands (lacking hour and up-and-down hands), Earnshaw escapement, spring foot detent, cut bi-metallic balance, segmental heat compensation weights, blued steel helical balance spring brass bowl (lacking side fittings; defective mainspring)