A. Lange & Söhne produced watches with "seconde-morte" jumping seconds from 1867-1930. Adolf Lange designed the first iteration in 1867, which contained the mechanism powering the seconds between the plates. In 1877, the firm patented a design where they placed the mechanism above the backplate, as seen in the present lot. The company continued to make modifications to the bridge for the seconds-wheels and the release lever throughout the production period, and around 320 watches were fitted with this device.
For other Lange dead second watches, see Meis, Watchmakers of Dresden Vol II, 2012, pp. 218-225, figs. 701-726.
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