Very rare Swiss silver cylinder watch with regulator dial Circa 1905

Silver open faced Montre Panoramique
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A very rare Swiss silver open faced cylinder pocket watch, a Montre Panoramique, circa 1905. Bridge movement, Brevet 24792 and D.R.G.M. 192177, cylinder escapement. A white enamel regulator dial, in the upper half radial black time indication with Roman hours and outer minute divisions, in the lower half blue Arabic subsidiary seconds with a rotating round aperture displaying four photographs of politicians and military leaders, applied gold floral decoration. The case back is engine-turned, polished bezels. Case numbered.
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Diameter: 51 mm
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Weight: 92 g
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Signed: Arnold Schweizer-Schatzmann