German pocket watch with unusual crown wind Circa 1875

Open faced gold pocket watch by Albert Lescow
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A German pocket watch with unusual crown wind as invented by Olivier Courvoisier of Neuchâtel, circa 1875.
18 carat gold case; white enamel signed dial with Roman hours, sunk subsidiary dial for the seconds and blued spade hands; bridge movement and a gold screw compensation balance.
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Diameter: 48 mm
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Weight: 91 g
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Signed: Albert Lescow, Osnabrück
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Albert Lescow was a member of the Urania Glashütte association. His father was also a maker in Osnabrück and had learned the art of watchmaking with master Heyl. Today’s modern watch and clock wholesaler Baron is a descendant of Lescow, who died in World War I.
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The Museé d’Horlogerie in Geneva exhibits an ebauche with anchor escapement and the same type of winding system. It was developed by Oliver Courvoisier, who received the English patent no. 1114 in 1873 for it.