German 18 carat gold chronograph pocket watch Circa 1885

Gold watch made for Frederico Krüssmann & Cia.
–
A German 18 carat yellow gold open faced keyless pocket watch, made by A. Lange & Sohne in Glashütte b/Dresden, circa 1885. Made for Frederico Krüssmann & Cia., Relógio de Precisão, Rio de Janeiro, Brasil. A polished case back, Lucia-type case with an independent dead seconds chronograph, activated by the single push piece located on the crown. White enamel dial with radial Roman numerals, outer minute track, subsidiary seconds at 6 and blued steel pear shaped hands. A gilded brass, ¾ plate, going barrel, 21 jewels, screwed-chatons, Lange gold straight line lever escapement, cut bimetallic compensated balance with gold poising screws and blued steel hairspring with terminal curve, polished steel index regulator; patented independent dead seconds stop watch mechanism works on the top plate. Signature on the dial, cuvette and movement.
–
Diameter: 54 mm
–
Signed: A. Lange & Sohne, Glashütte b/Dresden
–
Accompanied by original fitted box, original certificate (blank), and a copy of the invention patent.
–
Movement based on the German invention patent No. 182, delivered on August 3, 1877, to A. Lange & Söhne, Glashütte b/Dresden, for a second movement with a jumping hand.