Early French silver octagonal verge pocket watch Circa 1615

Single-handed verge pocket watch
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A French silver and gilded brass octagonal verge pocket watch, circa 1615. The original movement was altered to prolong its useful life, verge escapement, pierced cock and pillars, gut-driven fusee. The case is engraved with an erotic scene. Silver engraved dial, gilt-brass chapter ring with Roman hours and a single hand. 
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Signed: Charles Perras A Bloys
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Made by Charles Perras, Blois, France.
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The appearance of the watch suggests it was much used.