JOHN ROGER ARNOLD No. 593; A very rare one-day marine chronometer, the silvered dial signed Arnold, London 593 with Roman chapters, subsidiary seconds dial at VI, blued steel hands, the bezel with covex glass and bayonet fittings to drum-shaped bowl, Arnold escapement and spring detent with steel pallet in keyhole slot, "U + O2 balance with timing screws, undersprung gold helical balance spring, 1800 quick train, the top-plate inscribed Jno. R.Arnold, London, Invt et Fecit, No.593, the whole in brass drum with winding hole in base with shutter-plate cover

Details

JOHN ROGER ARNOLD No. 593; A very rare one-day marine chronometer, the silvered dial signed Arnold, London 593 with Roman chapters, subsidiary seconds dial at VI, blued steel hands, the bezel with covex glass and bayonet fittings to drum-shaped bowl, Arnold escapement and spring detent with steel pallet in keyhole slot, "U + O2 balance with timing screws, undersprung gold helical balance spring, 1800 quick train, the top-plate inscribed Jno. R.Arnold, London, Invt et Fecit, No.593, the whole in brass drum with winding hole in base with shutter-plate cover
Dial; 80mm.diam.

Literature

Anthony G.Randall & Richard Good, Catalogue of Watches in the British Museum VI, London, 1990.

Lot Essay

This rare balance is a variation of Arnold's "U and O" in that the meant-time screws are in the same plane as the cross- arm extending beyond its outer extremeties. This variation is not mentioned in Arnold & Son (Vauchy Mercer). Tests to the cross-arm indicate that it appears to be wholly of platinum and not necessarilly compound with silver. A similar movement numbered Arnold, London 595 is described and illustrated in the catalogue of watches in the British Museum op. cit.

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