German 18K pink gold Glashütte calender watch Circa 1885

Pink gold open faced pocket watch
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A rare and fine pink gold open faced calendar watch, circa 1885. First quality gilt 3/4 plate lever movement, jewels carried in gold screw down chatons, diamond endstone, gold escape wheel and pallet, central white enamel mean time dial, Roman numerals, subsidiary seconds, blued steel  moon style hands, matte gilt outer ring calibrated with the date and inset with month aperture, inner gilt matte chapter ring calibrated with days of the week, repeated five times, days denoted by initials, with a blank space indicating Sunday, push piece at 1 for setting month and date, 18k pink gold case, case back engraved with monogram, pink gold cuvette, dial, case, cuvette and movement signed.
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Diameter: 52 mm
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Signed:  A. Lange & Söhne Glashütte B/Dresden
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This watch is one of 30 watches created to the specifications of Otto Fleischhauer’s calendar patent.  Fleischhauer registered his patent, no. 25267 in Berlin on June 5th, 1883.  He collaborated with A. Lange & Söhne to produce his calendar system.The unusual calendar work proved somewhat awkward compared to other contemporary setting designs on the market, and never gained popularity.  Of thirty pieces made, one other, no. 19065, was sold at auction, in 2015. This is the first time the present lot, no. 19079, has been offered at auction.
Fleischhauer’s design drawings and the patent for this watch can be found in Reinhard Meis, A. Lange & Söhne, the Watchmakers of Dresden.