German verge watch with two enamel portraits Circa 1760

Verge pocket watch with two enamel portraits
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A German silver pair cased watch, the outside case with a portrait of young gentlemen on back in enamel painting, circa 1760
White enamel dial with decorative hands, black Roman numerals, the outside ring with black Arabic numerals.
German verge full plate fire gilt movement, enamelled bridge cock also with portrait, foot nicely pierced and engraved.
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Diameter: 50 mm
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Weight: 108 g
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Signed: Von Hilten fr. furt
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Matthäus Christian von Hilten was a watchmaker in Frankfurt who became a master in 1729. He died in 1770

This unusual pocket watch shows the portrait of a distinguished gentleman in a blue garment and powdered wig twice.
Once on the outer case and again on the balance bridge of the movement. Who knows, it could be a portrait of the watchmaker himself.