German silver pair-cased wandering hour pocket watch Circa 1700

Silver open faced verge pocket watch
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A very fine and very rare German, silver pair-cased, wandering hour pocket watch, circa 1700. Outer: square hinge, the back with radial fluted pattern and central rosette, the bezel decorated with an alternating diamond and dot design. Inner: polished case, deep back, split bezel. Silver dial, aperture for the wandering hours with finely chased foliate gilt mask, Roman hour numerals in two further apertures, outer minute sector with Arabic five-minute numerals, inner scale from 1-4, finely pierced and chased gilt foliate mask below the dial. A frosted gilt full plate movement, large pierced foliate pillars, fusee with chain, verge escapement, three-arm steel balance, short balance spring, finely pierced and engraved foliate winged balance cock, silver regulation disc. Dial and movement signed.
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Diameter: 57 mm
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Signed: Johann Christoph Strigell  Kreilsheim
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Johann Christophe Strigel is listed in: Jurgen Abeler book “Meister der Uhrmacherkunst”, 1977 edition. working at the end of the 17th century and the beginning of the 18th century. An annular slot extending through half a circle appears in the upper half of the dial. Round its outer edge on the dial plate number 0-60 in five-minute intervals and minute graduations. Under the dial plate is another rotating plate, the full diameter of the dial. Two holes are cut out of the rotating plate exactly opposite to each other, pivoted to the rotating plate are two smaller rotating plates, one carrying the odd numerals from 1-XI, the other the even numerals from II-XII. These numbers appear each through one of the circles, by means of a detent the numbered plates are advanced once an hour. When one-hour numeral disappears from view the next one appears on the other side at 0. The wandering hour feature is usually found on German watches of the late 17th and early 18th Century, and rarely on English watches of the same period.