Rare German 18k gold watch with triple calendar Circa 1885

Gold keyless wind pocket watch 
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A Glashütte rarity, not yet listed Moritz Grossmann Glashütte with triple calendar based on the Fleischhauer patent, with documentation from Glashütte, circa 1885. An 18K gold, à-goutte case, dome inscribed “PATENT”, Moritz Grossmann precision lever movement, best quality 1A, with screwed gold chatons, gold lever and gold escape wheel, triple calendar watch based on the patent 25267 of Otto Fleischhauer, punched with the Grossmann punch, two rotating rings on the front side with day and date indication and aperture for the month, enamel dial, fine gold hands with jewels, subsidiary seconds, red seconds scale, red minute scale.

The watch is in a completely unrestored condition with natural patina on the movement and unpolished case and is an absolute rarity. According to Mr. Reichel, director of the watch museum Glashütte, this watch is not yet listed and unknown and is one of the few watches manufactured and sold by Moritz Grossmann himself, i.e. from the year 1885.
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Diameter: 51 mm
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Weight: 120 g
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Signed:  A. Lange & Söhne  Glashütte
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So far only 5 more of these watches are known today (report/certificate from Glashütte is available!) The calendar movements according to the Fleischauer patent, manufactured by Moritz Grossmann, which were taken over and sold after his death by the company A. Lange & Söhne, can be characterized as followed: – Date indications by numerals and letter rings outside the dial and connected to the gear. – Winding, time and date setting in typical manner of Grossmann with a large symmetric rocker, which can be used by 2 pushers on the right and left of the pendant. Otto Fleischhauer in Berlin had the idea of a calendar watch and sent vague ideas with sketches to the Berlin Patent Office on July 15th, 1883. These sketches did not contain any ideas about required parts or proportions. In order to realize the idea of the calendar watch, a completely new construction was necessary. So Fleischhauer asked Moritz Grossmann to realize his ideas and he redesigned the whole watch type. His ideas were then confirmed by drawings of this watch. In 1884, Fleischhauer patented his idea in England as well, but offered the patent for sale just one year later, immediately after Grossmann’s death. According to Glashütte museum documents, all 20 watches that Grossmann had already manufactured and not yet sold, were exclusively taken over and sold by the Lange & Söhne company. All watches got the signature of the Lange & Söhne company on the dial and movement. Excluded from this is the first watch with the number 6141 and the other watches of the first small series with the numbers 8262, 8263, 8264 and 8265, which have no signature on the dial and are not included in Huber’s “Langeliste” of 1999. According to our information, the last known Fleischhauer watch (no. 19065 with Lange signature) was sold at Dr. Crott’s auction for €73,000.