German silver and tortoiseshell verge pocket watch Circa 1690

A German silver and tortoiseshell key wind pair case pocket watch, circa 1690. Gilt full plate fusee verge movement, pierced and engraved balance cock, silver regulation, hybrid pillars (AF). Silver champlevé dial, gilt centre with portrait, Roman numerals, outer minute divisions with Arabic numeral 5 minute markers, date aperture above 6 and blued steel hands. Polished inner case, studded tortoiseshell outer. Dial and movement signed.
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Diameter: 52 mm
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Signed: Michael Brosy Friedberg
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Outer and inner case are not matching.