Dutch astronomical pre balance spring watch Circa 1675

Open faced originally Dutch, verge pocket watch
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An important and very fine astronomical pre- balance spring watch, circa 1675.
Silver case with lavish floral chasing and engraving, large lateral hinge, ball pendant with engraved “fleur de Lys”.
Applied eccentric silver hour ring with Roman numerals dial, applied silver chapter ring with Arabic numerals for moon age, central silver disc with opening for the moon phase, applied silver date ring; three  windows showing the stars at “12”, the months and their lengths with the seasons at “4” and sunrise and sunset at “8”; gilt dial with floral engraving, blued hands.
Full plate movement, fiegilt, signed, chain/fusee, engraved and pierced movement pillars, verge escapement, applied blued pierced click work, iron ring balance without balance spring, florally engraved and pierced balance cock.
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Diameter: 51 mm
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Weight: 114 g
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Signed: Charles & Pierre Landreau, Amsterdam
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