Historical and large Swiss cylinder watch with music Circa 1900

Gunmetal open faced musical watch by Albert Didisheim & Frères
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A historical Swiss decorative and large gunmetal open faced cylinder musical pocket watch, circa 1900. Barillet-type pinned cylinder musical movement, keyless winding.
White enamel dial. Round-shaped case, the back with an inserted gilded metal medal showing Wilhelm Tell and his arbalest. Comes with a copy of the patent.
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Diameter: 62 mm
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Signed: Albert Didisheim & Freres
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Movement based on the Swiss invention, Patent No. 6776 delivered on June 13, 1893 to Albert Didisheim & Frères, La Chaux-de-Fonds, for a “Système de raquette permettant un grand déplacement des goupilles”.