Indian ring watch with high grade diamond bezel Circa 1870

Open faced gold ring watch by Hamilton
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A rare and solid gold Indian ring watch with high-grade diamond bezel and original box, circa 1870.
Hinged 18 carat gold special ring with solid and engraved mid section, integrated watch and rotating bezel with diamonds; special winding mechanism by turning the bezel, small lateral hatch with hidden setting mechanism and glazed cylinder movement; white enamel dial with Roman numerals and original steel hands.
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Diameter: 16 mm, ring size 50 mm
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Weight: 14 g
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Signed: Hamilton Calcutta
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A comparable watch was offered in Geneva auction in 2000
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HISTORY AND MARKS OF HAMILTON & CO. CALCUTTA
Robert Hamilton (1772-1848) arrived in India and started work in Calcutta in 1808. He opened his Jewellery and Silversmithing shop at 5 Tank Square in 1808 under licence from the East Indian Company (1).
In 1811 the business moved to 7 Court House Street, where it remained until 1973 when it finally closed. Needing capital to expand the business Robert Hamilton took two partners, Henry and James Glazbrook in 1811. Robert Hamilton’s interest ceased in 1817, and he dedicated the latter part of his life to collecting paintings, including works by Rubens, Velazquez and Holbein.
During the subsequent years the business had many partners including: Henry and James Glazbrook, James Middleton, George Thoerpe, Charles Galliards, Alexander Rogers II, Henry Augustus Woolaston, William , Joseph, John and George Farrell Remfry, Robert John Dring and Thomas William Brookes.
H&Co opened branches in other parts of India: Bombay (1833-36 and from 1868); Delhi and Simla (1865 onwards).