Unusual large silver English pair cased verge Circa 1695

Unusual large silver pair cased verge
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An English verge with an unusual four wheel train and twenty four hour dial in silver pair cases, circa 1695. Deep full plate fire gilt movement with tulip pillars. Unusual fusee and chain, the lower half cut for the chain allowing only four turns, worm and wheel barrel setup between the plates. The centre wheel rotates once every two hours. Extra wheel added to the train so that the plain steel balance beats at a normal rate. Pierced and engraved winged cock with mask, pierced and engraved foot and plate for silver regulator disc. Silver pendant and bow, the inner with apertures for winding and regulation.
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Diameter: 59 mm
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Signed: Sam Williamson Torbock
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A very unusual watch, the special fusee and train to allow the minute hand to rotate once every two hours.  The fine white enamel dial probably a later purpose made replacement