English gold decorative duplex pocket watch Circa 1805

Gold, enamel, pearl and diamond pocket watch 
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A large English, 18 carat gold, enamel, pearl and diamond set pocket watch, made by William Anthony in London, circa 1805. Directoire style case, master mark IM, back decorated with translucent Imperial blue enamel, over elaborate engine turning with rose cut diamond set applied rosette and large diamonds in the center. Azure enamel frame with red enamel, pearl set bezels and pendant. Hinged gold cuvette fixed to the movement ring. White enamel dial, radial Roman numerals, outer minute divisions and gold arrow hands. A gilt brass, fully chased movement with scrolling foliage decoration, Chinese caliber drawn from that of Lepine with free standing barrel, duplex escapement, plain flat five arm polished steel balance with flat balance spring and diamond end stone. Signature on the case and movement.
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Diameter: 64 mm
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Signed: William Anthony  London
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Some damaging on the case.
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William Anthony, born circa 1765, worked in Red Lion Street, St John’s Square, Clerkenwell, where he made high-end, decorative watches for the Chinese market. One of his well-known styles includes oval dials and hands that are jointed to automatically adjust to the changing radius of the dial as they travel around. As a successful tradesman, Anthony played an active part in founding the Watch- and Clockmakers Benevolent Association in 1815. However, after establishing the association, he suffered a series of losses following the unsuccessful litigation with Grimaldi & Johnson; an ill-fated attempt to set up a commercial exhibition in the Somerset Gallery, Strand, of Commonwealt,h presenting the Stuart costume displayed on wax models. He died in straitened circumstances in 1844.