Watch no. Unknown

Case: Replacement Dial: Movement: Provenance: 18?? - Potter, Geneve 1997 - Antiquorum, 18 Oct 1997, est CHF8-10,000, sold CHF10,350, "Albert H. Potter & Co., Chicago (U.S.A.), made circa 1880, timed by James Murset. Rare keyless pocket chronometer workshop case. C. Three piece, massive with glazed back and milled bezels. D. White enamel with Arabic numerals and sunk subsidiary seconds. Blued steel Breguet hands. M. 21 "' , nickel plated, patented calibre, the bridges with "fausses cotes " decoration, 21 jewels, majority in screwed gold settings, great wheel screwed on to the barrel cap. Patented pivoted detent escapement, shock-absorbing counterpoised and off-set passing spring. Two-arm cut bimetallic balance, free sprung spherical balance spring. Signed on the movement. Dial signed by the precision timer. Diam. 56 mm. Notes This watch employs three of Potter ' s patents, the details of which are engraved on the bridges. The plate design, which is virtual machining from the solid, was patented on January 4, 1875, the escapement and presumably the great wheel design, on 11 October, 1875. Albert Potter's work is not only rare, but always of top quality and completely original design. "