English retrograde verge watch with moon phase Circa 1740

Silver pair cased pocket watch by Roger Dunster
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A very fine English/Dutch pair cased verge pocket watch with retrograde chapter dial and moon phase, circa 1740.
Two cases: a silver polished outer case with large lateral hinge and an inner case which is also silver polished. Signed silver champlevé dial with inlaid retrograde Roman hours, dial aperture for rotating blued disc with engraved sun and moon, date aperture at “6” and a baluster-shaped single gold hand. Fine full plate movement, keywind, firegilt and signed, with applied engraved and pierced ornaments, chain/fusee, square baluster pillars, three-arm brass balance and a fine engraved balance cock with mascaron.
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Diameter: 49 mm
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Weight: 114 g
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Signed: Roger Dunster, London and Amsterdam
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English – Dutch watchmaker, Roger Dunster
Roger Dunster was probably born in London around 1675, he was the son-in-law of Ahasuerus Fromanteel who was a business partner of Christopher Clarke in the company Fromanteel & Clarke. He worked in Amsterdam from 1694, and later became a business partner of Christopher Clark in the Clarke & Dunster company from 1722 to around 1730. Afterwards he only worked under his own name, because Christopher Clark moved back to London. Various large clocks from Dunster are also known, such as floor clocks and table clocks. Roger Dunster died in 1747. In 1744 he was based at the “Vijgendam” in Amsterdam. He is currently considered one of the most important watchmakers in Amsterdam.
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Retrograde
An hour, minute, seconds or calendar hand which moves across a scale and, at the end of its cycle, returns immediately to zero to begin again.
Moon phases
A mechanism and display representing the different phases of the moon. A complete lunation takes 29 days, 12 hours, 44 minutes and 2.8 seconds and is divided into four phases. These are new moon, first quarter, full moon, last quarter.