French gilt-brass and open faced verge watch Circa 1620

Early gilt-brass oval verge watch
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A remarkable, early and rare one handed watch with sun dial in the back, circa 1620.
Brass case, gilt, glazed, in the back scale, raisable gnomon and compass, gilt dial, silvered chapter ring, firegilt brass full plate movement, gut/fusee, verge escapement, plain two-arm iron balance without balance spring.
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Diameter: 39 x 52 mm
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Weight: 131 g
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Signed:  Anthoine Marie  à Nantes