Japanese pair cased miniature verge pocket watch Circa 1760

Extremely rare open faced pocket watch of museum quality
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A very fine and extremely rare Japanese pair cased miniature verge pocket watch of museum quality, circa 1760.
Two cases: outer case – gold, polished, à goutte, with large lateral hinge; inner case – gold, polished. Gold dial with applied movable silver cartouches with inlaid Japanese numerals and blued steel “Poker & Beetle” hands. Full plate movement, keywind, applied engraved ornaments, signed, gilt and florally engraved, with chain/fusee, solid circular movement pillars, three-arm brass balance and pierced balance cock.
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Diameter: 25 mm
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Weight: 21 g
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Signed: Japan
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Similar watches are illustrated and described in: Wilhelm Brandes “Alte japanische Uhren”, Klinkhardt & Biermann 1976, page 124ff.