German rare pocket watch with regulator dial Circa 1790

Silver open faced pocket watch by Johann David Beck
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A gentleman’s rare German pocket watch with regulator dial and unusual designed virgule escapement, circa 1790.
Silver, tiered, engine turned case. Signed enamel dial; eccentric hour chapter ring with Arabic numerals and blued spade single hand; eccentric minute chapter ring with Arabic numerals and single Louis XVI hand and it has centre seconds. Full plate movement, keywind, signed, gilt, with large regulator scale, three-arm brass balance and a fine florally engraved and pierced balance bridge.
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Diameter: 56 mm
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Weight: 116 g
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Signed: John: Dav: Beck in Mainz