Unusual table chronometer escapement clock Circa 1840

Unusual table model clock with glass dome
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An unusual table clock model with chronometer escapement, possibly the work of a watchmaking school, circa 1840. The silvered dial ring has Roman hour numerals, a visible escapement section in the middle with an exceptionally large chronometer balance, blued Breguet steel hands and a helical hairspring.
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Diameter: 150 mm (dial), 220 mm (glass dome) and 130 mm (back brass plate)
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Signed: No name
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The item presented here was possibly the work of a watchmaking school.