Dutch exquisite one handed verge pocket watch Circa 1700

Open faced verge with date and indications of day and night
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A Dutch exquisite one handed verge pocket watch with date and indications of day and night, circa 1700.
The silver Champlevé dial has retrograde Roman hours. The hours are indicated by a blue steel disc which rotates once every 24 hours. This is viewed through a semi-circular aperture and has engraved on one half the gilt sun and on the other the moon. At the edge of the semi-circle the hours are marked from six through twelve and back to six in Roman numerals. As the sun disappears at the right of the aperture the moon appears at the left. The bottom half of the dial with signature “IAC HASIUS AMSTERDAM”, date window and punched foliage and a vase flanked by two birds.
Silver case, full plate movement, signed Jacob Hasius Amsterdam, chain/fusee, three-arm steel balance.
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Diameter: 52 mm
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Weight: 139 g
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Signed: Jacob Hasius, Amsterdam
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Jacobus Hasius was a maker who was active in Amsterdam after 1682 and produced high quality long case clocks, table clocks and watches. His brother Isaac Hasius was a watch- and clockmaker in Haarlem.
Jacob had his workshop at Jan Roodenpoortstorensteeg in Amsterdam. In the “Register van Goede Mannen” listing reputed watch- and clockmakers he is mentioned in 1704 and 1716. The British Museum in London has a long case clock by Hasius dating from around 1690 that features a hidden coat of arms.
Jacob Hasius‘ exact date of death is unknown; it is, however, often confused with that of his brother who died in 1747.