A. Lange & Söhne, Glashütte

AN EXCEPTIONAL AND VERY RARE SILVER OPEN-FACED KEYLESS 1A QUALITY ONE MINUTE TOURBILLON WATCH WITH SPRING DETENT CHRONOMETER ESCAPEMENT AND UP-AND-DOWN INDICATION CIRCA 1924, NO. 82013

• Movement: 1a quality, cal. 47 damascened German silver ⅔ plate movement, the spring detent chronometer escapement mounted within a one-minute tourbillon carriage, gold escape wheel, some jewels carried in gold screwed chatons, fusee and chain, bi-metallic compensation balance, diamond endstone, signed and numbered A. Lange & Söhne b, Dresden, no. 82013
• Dial: light grey silvered dial, raised gilded baton hour indexes, two subsidiary dials for constant seconds and 30-hour up-and-down indication, blued steel feuille hands, black outer minute track
• Case: "Bassine" silver case, gold capped crown and hinges, case signed A. Lange & Söhne Glashütte, case and cuvette numbered 82013
diameter 59mm

Provenance:
Dr. Crott & Schmelzer, Auktion XVI Aachen, 25 April 1981 (front cover) lot 86