English plain silver verge open faced pocket watch Circa 1696

Silver pair cased verge watch
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A pair cased verge pocket watch with silver champlevé dial and large opening to show the blued regulation disc; decorated with the supporters of the Royal arms: the crowned English lion and the Scottish unicorn, circa 1696.
The outer- and innercase are both silver, champlevé./silver dial, full plate movement, chain/fusee, three arm steel balance.
This rare English watch is regulated by turning a gilt and blued steel disc set below “XII” on the silver champlevé dial.
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Diameter: 58 mm
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Weight: 155 g
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Signed:  David Lestourgéon  London
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Watchmaker David Lestourgéon (1660-1731) was born in Rouen and came to London in 1681 as a Hugenot refugee. He was a member of the Clockmakers’ Company from 1698 to 1731. The style elements of the movement  such as the large peripheral balance bridge show clearly that the maker of the watch was French.