Datei:Datei Bonna Fréres Genève ca. 1789 (09).jpg

Beschreibung

Bonna Fréres Genève ca. 1789

Lizenz

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Außergewöhnliche, mit Email und Diamanten verzierte, achteckige Anhängeuhr mit Viertelstundenrepetition und sichtbarer, diamantbesetzter Unruh.

18 kt Roségold und Silber Gehäuse· transluzid blaues Email · Diamanten. Maße 23 x 36 mm. Email Zifferblatt, dezentraler Stundenziffernring mit röm. Zahlen, sichtbare fünfarmige Unruh mit Diamantreif auf polierter Stahlscheibe. Formwerk, 1 Hammer / 1 Glocke, Spindelhemmung, Schlüsselaufzug.

Dieses seltene Exemplar verfügt über einen Mechanismus zum wiederholten Anschlagen einer Glocke in Miniaturform. Diese außergewöhnliche Errungenschaft der Verkleinerung auf engsten Raum ist auch heute noch schwer zu realisieren. Die Anhängeuhr verbindet Schmuck und Uhrmacherkunst und war ein neuartiges, faszinierendes "Spielzeug" für die Reichen und die Aristokratie. Bonna Frères waren zwischen 1770 und 1800 in Genf als Uhrmacher und Händler tätig.

An extraordinary, octagonal shaped pendant watch with quarter repeater, visible balance and decorated with enamel and diamonds.

18 K rose gold and silver Case · translucent blue enamel · diamonds. Diam. 23 x 36 mm. Enamel Dial, eccentric hour chapter ring with Roman numerals, visible five-arm balance with diamond ring on a polished steel disc. Moulded movement, 1 hammer / 1 bell, verge escapement, keywind.

This rare piece is fitted with a mechanism for repeatedly striking a miniature bell. This outstanding miniature device is a truly sophisticated accomplishment, that is difficult to realise even today. This pendant watch is a combination of a fine piece of jewellery with watchmaking craft and was a novel and fascinating "toy" for the noble and wealthy. Bonna Frères were active as watchmakers and retailers in Geneva from 1770 to 1800.

A very rare late 18th Century Swiss quarter repeating cylinder with visible balance in a diamond set gold pendant. Small full plate rectangular movement with canted corners. Almost half of the top plate cut away to accommodate the small bell. Keywound resting barrel, Polished steel cylinder, steel escape wheel. Decorative balance, the rim set with small diamonds visible through the dial. Four of the five arms of the balance are cut through to all to allow access to the top balance pivot. Slide quarter repeating on a bell. Signed white enamel dial with subsidiary of Roman numerals below the visible balance, blue steel Breguet hands. Small gold rectangular case with canted corners pierced and engraved to allow the bell to sound. Gold and enamel front bezel set with diamonds, gold bow set with small diamonds. Small steel lever at five o’clock for the repeat, sprung dust shutter to the slot. In a small fitted oval brown morocco gilt decorated presentation case signed for the retailer Russells. Lined with cream velvet the gold key is accessed by lifting the cushion.

A remarkable piece of Swiss watchmaking in excellent overall condition. It may have been inspired by the repeating ring watch made for King George III a few years earlier. Making such a small repeating movement where the bell occupies much of the space would have been a considerable challenge at the end of the 18th Century. The inclusion of the "mystery" top balance pivot made the task more difficult but accentuates the diamonds mounted on the balance catch the eye as it vibrates. Bonna Freres, Geneva 1770 - 1800.