A rare going barrel cylinder movement by J. R Arnold, Patent No.92 Ex: Charles Allix & Ass. Cat. 1993/94, Arnold, John Rodger, London, circa 1825, with Priest's patent keyless winding, original signed and numbered enamel dial, faint hairline crack. 4.9 cm. £350. Provenance: The private collection of a master watchmaker, purchased from UK dealers for their technical interest.