German silver verge watch with Champlevé dial Circa 1710

Open faced pocket watch with date
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Interesting and rare German pocket watch with date, circa 1710.
Pair cased, protective silver case, punched OHD, inner case also made in silver, master punch CIW, splendid German verge movement.
Signed and numbered on the main plate, original, signed Champlevé dial of silver, apertures of date, original blued steel hand, roman numerals.
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Diameter: 52 mm
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Signed:  Abraham Albert Busch  Hamburg
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Abraham Albert Busch registered watchmaker in Hamburg (1676-1720)