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Lot Essay
A simply phenomenal feat of engineering, this limited edition Jacob & Co. ‘Astronomia Sky in 18k Black Gold can only be described as awe-inspiring. Only 18 pieces of this black gold variant of the Astronomia Sky were made, the present watch is number 18, the final watch of the edition.
A miniature solar system, the revolving four-arm caliber JCAM11 movement with 60-hour power reserve appears to ‘float’ within the domed crystal of the case - an immense and highly impressive watchmaking achievement. Mounted on a vertical axis, each of the four arms has a unique complication exclusive to Jacob & Co. rotating around the central magnesium and hand-lacquered 24-hour day/night indicator globe of the earth; a spherical-shaped diamond with 288 facets known as the ‘Jacob-Cut’, a patented triple-axis flying tourbillon, a dial for the hours and minutes with a patented timepiece-differential gear system; and an orbital seconds dial. All rotate on their individual axis, and around the central axis. The platform’s full rotation takes 20 minutes. Heavily focused on astrological tracking, the caliber also features a sidereal year display that rotates once every 365.25 days, a 1-year celestial panorama showing stars visible from the Northern Hemisphere on a mirror-polished black (for this special edition) titanium rotating base displaying the constellations of the night sky.
The stunning domed sapphire crystal allows an unhindered view of the spectacular movement and visually mesmerizing triple-axis flying tourbillon. No less mesmerizing is the ravishing spherical 1.00 carat ‘Jacob Cut’ diamond ‘moon’ with an incredible 288 facets. This diamond, which is located on one of the four satellites must be cut not only to the special spherical shape but must also weigh exactly the same as each of the other three satellites; time display; triple-axis tourbillon; orbital seconds. To achieve this amazing triumph of diamond cutting takes a skilled craftsman at least two weeks of dedicated, painstaking work. The globe of the earth is made of magnesium coated with hand-painted blue lacquer and completed with white gold continents. Each pair of opposing arms are perfectly calculated counterweights of one another and even the smallest variation in weight would cause the movement to malfunction. The fact that the caliber JCAM11 movement runs apparently effortlessly is a testament to the peerless engineering, mathematical and design skills of Jacob & Co’s craftsmen.
The manual triple-axis flying tourbillon is constructed with a delicately decorated openworked cage that carries the balance wheel and escapement. This outstanding tourbillon rotates on three axes simultaneously. A full rotation on the 1st axis takes exactly 60 seconds, as in the traditional single-axis tourbillon. The 2nd axis of rotation requires 5 minutes to complete, while the 3rd axis of rotation is made possible by the 20-minute, four-arm rotating platform of the Astronomia movement – a new and boldly original method of tourbillon function.
A miniature solar system, the revolving four-arm caliber JCAM11 movement with 60-hour power reserve appears to ‘float’ within the domed crystal of the case - an immense and highly impressive watchmaking achievement. Mounted on a vertical axis, each of the four arms has a unique complication exclusive to Jacob & Co. rotating around the central magnesium and hand-lacquered 24-hour day/night indicator globe of the earth; a spherical-shaped diamond with 288 facets known as the ‘Jacob-Cut’, a patented triple-axis flying tourbillon, a dial for the hours and minutes with a patented timepiece-differential gear system; and an orbital seconds dial. All rotate on their individual axis, and around the central axis. The platform’s full rotation takes 20 minutes. Heavily focused on astrological tracking, the caliber also features a sidereal year display that rotates once every 365.25 days, a 1-year celestial panorama showing stars visible from the Northern Hemisphere on a mirror-polished black (for this special edition) titanium rotating base displaying the constellations of the night sky.
The stunning domed sapphire crystal allows an unhindered view of the spectacular movement and visually mesmerizing triple-axis flying tourbillon. No less mesmerizing is the ravishing spherical 1.00 carat ‘Jacob Cut’ diamond ‘moon’ with an incredible 288 facets. This diamond, which is located on one of the four satellites must be cut not only to the special spherical shape but must also weigh exactly the same as each of the other three satellites; time display; triple-axis tourbillon; orbital seconds. To achieve this amazing triumph of diamond cutting takes a skilled craftsman at least two weeks of dedicated, painstaking work. The globe of the earth is made of magnesium coated with hand-painted blue lacquer and completed with white gold continents. Each pair of opposing arms are perfectly calculated counterweights of one another and even the smallest variation in weight would cause the movement to malfunction. The fact that the caliber JCAM11 movement runs apparently effortlessly is a testament to the peerless engineering, mathematical and design skills of Jacob & Co’s craftsmen.
The manual triple-axis flying tourbillon is constructed with a delicately decorated openworked cage that carries the balance wheel and escapement. This outstanding tourbillon rotates on three axes simultaneously. A full rotation on the 1st axis takes exactly 60 seconds, as in the traditional single-axis tourbillon. The 2nd axis of rotation requires 5 minutes to complete, while the 3rd axis of rotation is made possible by the 20-minute, four-arm rotating platform of the Astronomia movement – a new and boldly original method of tourbillon function.