PHILIP HART No. 1858: A particularly small one day marine chronometer, the silvered dial signed One-day chronometer, Philip Hart, London 1858, Roman hour chapters, Arabic 5-minute intermarkers, subsidiary seconds dial at VI, blued steel hands, full-plate gilded pocket chronometer-size movement signed on the top-plate H Robinson, 3 Cambridge Ter. Islington, London, and dated on the foot of the balnace cock A.D. 1858, Earnshaw escapement, dovetail spring detent to side of banking block, cut bi-metallic balance with underslung segmental heat compensation weights, blued steel helical balnace spring, now in brass bowl and gimbol and later 3-tier brass-bound mahogany box, with outer guard box