This is a rare and exquisite early 19th Century thermometer created by Breguet, one of the most renowned watchmakers of all time. It is encased in a gold oval ring and features a beautifully designed gilt plate with a bimetallic strip and quadrant gears that are linked to a central pinion. The fine gold dial is signed and engine turned with "Thermometre" markings, and the circular chapter is marked in degrees with "Glace – Tempere – Chaleur – Fievre" at the quarters. The gold oval case has an engine turned middle and is glazed on both sides to reveal the intriguing mechanism. The reeded gold swivel band allows for use as a ring or perhaps a fob. This exceptionally rare piece comes with a certificate from the archives which shows it was sold for 336 Francs in 1810. Breguet has produced very few thermometers, with the ninth sold to Prince Antonio of Spain in 1813. This ring thermometer is illustrated in Breguet - Watchmakers since 1775 by Emanuel Breguet on page 263. Overall, this is an elegant and unique piece from an iconic watchmaker that any collector would be proud to own. It measures 24 x 29 mm in diameter and is signed Breguet et Fils.

Signed Breguet et Fils
Circa 1810
Diameter 24 x 29 mm

Origin French
Condition Excellent
Materials Gold
Carat for Gold 18 K