Datei:F. Berthoud No. 757 (1) Zifferblatt.jpg

F. Berthoud No.757 (1) Zifferblatt.

A late 18th Century French verge in a three colour gold consular case. Full plate gilt fusee movement. Finely pierced and engraved bridge cock with steel coqueret, plain three arm gilt balance with blue steel spiral hairspring. Silver regulator dial, blue steel indicator. Round pillars. Winding through the white enamel dial with Roman and Arabic numerals, pierced gold hands. Decorative engraved 18 carat consular case with applied three colour gold work a classical scene in an oval cartouche on the back. Signed F. Berthoud a Paris 757, Circa 1780, Diameter 42 mm , Depth 9 mm, Ferdinand Berthoud: born 1727, died 1807. A most eminent maker who did much experimental work on precision timekeepers and published many papers on the subject. Developed a spring detent chronometer escape, probably

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