Unusual English Swiss silver pocket watch with calendar Circa 1900

Silver open faced pocket watch with a rare caliber
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An unusual pocket watch with calendar, of chronometer quality, probably assembled in Switzerland, circa 1900. The open faced case is crafted from silver, numbered, engine turned on the back with a monogram FP in the center and was probably made by George Fox & Co. in Southport, England. The white enamel dial has a rare patented calendar, the date digits can be set separately, underneath the rotating English day and has black Roman hour numerals and a subsidiary seconds dial with black Arabic numerals at six o’cloc and black hands. The rare caliber movement has a Swiss anker chronometer with lever escapement.
The dial is inscribed with the patent number and the cuvette is signed and inscribed Frank Parmeter.
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Diameter: 51 mm
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Weight: 111 g
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Signed: George Fox & Co.79 Lord S^T Southport                
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Curiously, the separate digit setting also allows the 00 position to the 39^th of the month.