A Regency one-day quick train marine chronometer movement and bowl with U + O balance

JOHN ROGER ARNOLD, CIRCA 1825

Details

A Regency one-day quick train marine chronometer movement and bowl with U + O balance
John Roger Arnold, circa 1825
The silvered dial signed ARNOLD. LONDON and numbered 586, Roman hour numerals, subsidiary seconds dial (at VI), blued steel hands, 18,000 count train, Arnold escapement and U + O balance with bimetallic cross arm, undersprung blued steel helical balance spring, Arnold spring detent with metal locking pallet, the top-plate inscribed Jno. R. Arnold. LONDON Invt. et Fecit but numbered 386, in brass bowl numbered 586, bayonet fitting bezel with convex glass
75 mm. dial diam.

Lot Essay

It is not known why the dial and bowl are numbered 586, whereas the movement is numbered 386. Arnold No. 586 is recorded as a Royal Observatory issue chronometer but there is no evidence of this chronometer ever having had the Government Mark engraved on it. Inside the bowl is a repairer's scratchmark - E. Payne 5 December 1910. There are no bowl fittings nor is there any indication that it has ever been fitted with them.

A form of this balance is illustrated in Mercer's J. Arnold & Son, A.H.S. 1972 Plate 173, but in this the O is mounted above the balance bimetallic cross-arm whereas in No. 586 the O is mounted beneath it.

A similar chronometer movement and bowl John Roger Arnold No. 593 was sold in these rooms 15 June, 1994, Lot 353.

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