English centre seconds verge in silver pair cases Circa 1760

Silver open faced centre seconds pocket watch by Thomas Aspinwall
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A very fine English pair cased verge pocket watch with rare centre seconds, circa 1760. There are two cases. The outer case is silver and polished with a D*B punch mark from the case maker and a large lateral hinge. The inner case is also silver and polished, with the same D*B punch mark from the case maker and a signed movement protection cap. The dial is enamel with radial Roman numerals, a centre second hand and gold Poker and beetle hands. The signed full plate movement is keywind and fire gilt, with applied engraved ornaments and conical movement pillars, a chain/fusee, a lateral steel stop lever, and a three-arm steel balance. The balance cock is finely florally engraved, pierced with a mascaron.
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Diameter: 50 mm
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Weight: 126 g
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Signed: Thos Aspinwall  Manchester
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Centre seconds watches of the period are rare. Most were made with cylinder escapements, but this one is rare in having a verge.
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Thomas Aspinwall was a watchmaker in Manchester and lived around 1760. He was declared bankrupt on March 22, 1794.