111st Auction
2024/11/16
Lot 305
Courvoisier Frères
An extremely rare, astronomical pocket watch with equation and display of sunrise and sunset
Sold
estimated
6.500—10.000 €
Price realized
8.800 €
specific features
Case
18 K rose gold, smooth, case maker punch mark "PIG".
Dial
Enamel, kidney-shaped opening with guilloche pattern and translucent cobalt blue enamelled background for displaying the sunrise and sunset, chapter ring for date at "3", off-centre hour display with Roman numerals at "6", month display including their length at "9".
Movement
Full plate movement, keywind, chain/fusee, cylinder escapement, three-arm brass balance.
Case no.7861
Diam.54 mm
Circa1810
Ctry.Switzerland
Wt.102 g
In astronomy, the equation of time is the difference between apparent solar time and mean solar time. The equation of time is different every day; its value alternates between -14.59 and +16.15 minutes. A sector or a hand is used to indicate the difference.