German silver open faced cylinder pocket watch Circa 1815

Plain silver pocket watch by Wilhelm Gerwig
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A very interesting German cylinder watch with a very rare calibre, circa 1815.
Magnificent fire-gilded cylinder movement with a very unusual calibre. Plain polished silver case, case maker’s mark IBP, dust cover inscribed in German Wilhelm Gerwig 1815. Simple enamel dial with Breguet-style radial hours, outer minutes track, and fine gold Breguet-style hands.
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Diameter: 54 mm
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Weight: 87 g
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Signed: Wilhelm Gerwig
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Well-known in Germany was Robert Gerwig, born in 1820, 1st director of the Furtwangen watchmaking school and founder of the 1st watch museum in the world.