Swiss silver pocket watch “Mystérieuse” with both sides glazed Circa 1885

Pocket watch with hands driven by rotating discs  
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A silver rare “Mystérieuse” pocket watch with both sides glazed, made by Armand Schwob & Frère in la Chaux-de-Fonds, Switzerland, circa 1885. The open faced numbered case of this watch was crafted from silver and has sides glazed, so that it is possible to look through the watch without seeing the movement. The dial has Roman hour and Arabic minute numerals and hands driven by rotating discs. The crescent shaped movement is located directly under the crown in the concealed area and probably has a cylinder escapement.
Case signed.
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Diameter: 54 mm
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Weight: 88 g
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Signed: A S & F, Mystérieuse, Breveté 22.VI.88, S.G,D.G.                
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Crescent shape
A crescent is a curved shape that is wider in the middle than at its ends, like the shape of the moon during its first and last quarters. It is the most important symbol of the Islamic faith.
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Armand Schwob & Frère
Armand Schwob & Frère, a watch manufacturing company based in La Chaux-de-Fonds, Switzerland, at 14 Avenue Leopold Robert. The company was founded on November 1^st, 1881 and registered on January 27^th, 1883 as a company for the manufacture of metal clocks of its own in La Chaux de Fonds. The company was owned by Armand Schwob & Abrabam Schwob, who came from Basel but lived in Paris. In Paris, the company was represented with a sales point for watches and jewellery on 19 Boulevard Bonne-Nouvelle.
The company obtained two Swiss Patents, 2445 and 2526, in 1881 and an English Patent No. 9865 in July 1888 for the invention of Transparent Watches.