Fleischhauer registered his patent, no. 25267 in Berlin on June 5th, 1883 and engaged Moritz Grossmann to design and produce his calendar watches. However, following Grossmann's sudden death, Lange acquired the movements and completed them. Apparently, the watches did not enjoy great popularity, as production lasted only from 1886-1887.
The 'Fleischhauer' movements were sold with Lange numbers, but a few of them (such as the present example) retained Grossmann's numbering. The calendar is adjusted via a pusher beneath the crown above one o'clock - with the button depressed, the month is advanced by turning the crown to the right, whilst turning the crown to the left advances the date.
For a similar A. Lange & Söhne with Fleischhauer’s patent see: Sotheby's New York, 6 December 2017, lot 806. Fleischhauer's design drawings and the patent for this watch can be found in Reinhard Meis, A. Lange & Söhne, the Watchmakers of Dresden, 1997, pp. 332 & 340.
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