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JACOB & CO. A VERY FINE, EXTREMELY RARE AND IMPRESSIVE 18K PINK GOLD AND ORANGE SAPPHIRE-SET LIMITED EDITION GRAVITATIONAL TRIPLE AXIS TOURBILLON WRISTWATCH WITH SKY INDICATOR OF THE CELESTIAL PANORAMA, MONTH, DAY/NIGHT INDICATOR AND ORBITAL SECOND HAND
JACOB & CO. A VERY FINE, EXTREMELY RARE AND IMPRESSIVE 18K PINK GOLD AND ORANGE SAPPHIRE-SET LIMITED EDITION GRAVITATIONAL TRIPLE AXIS TOURBILLON WRISTWATCH WITH SKY INDICATOR OF THE CELESTIAL PANORAMA, MONTH, DAY/NIGHT INDICATOR AND ORBITAL SECOND HAND
JACOB & CO. A VERY FINE, EXTREMELY RARE AND IMPRESSIVE 18K PINK GOLD AND ORANGE SAPPHIRE-SET LIMITED EDITION GRAVITATIONAL TRIPLE AXIS TOURBILLON WRISTWATCH WITH SKY INDICATOR OF THE CELESTIAL PANORAMA, MONTH, DAY/NIGHT INDICATOR AND ORBITAL SECOND HAND
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JACOB & CO. A VERY FINE, EXTREMELY RARE AND IMPRESSIVE 18K PINK GOLD AND ORANGE SAPPHIRE-SET LIMITED EDITION GRAVITATIONAL TRIPLE AXIS TOURBILLON WRISTWATCH WITH SKY INDICATOR OF THE CELESTIAL PANORAMA, MONTH, DAY/NIGHT INDICATOR AND ORBITAL SECOND HAND
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> Some watches are pictured with straps made of en… Read more JACOB & COTRIPLE AXIS GRAVITATIONAL TOURBILLONNO. 15/18ANOTHER PROPERTY
JACOB & CO. A VERY FINE, EXTREMELY RARE AND IMPRESSIVE 18K PINK GOLD AND ORANGE SAPPHIRE-SET LIMITED EDITION GRAVITATIONAL TRIPLE AXIS TOURBILLON WRISTWATCH WITH SKY INDICATOR OF THE CELESTIAL PANORAMA, MONTH, DAY/NIGHT INDICATOR AND ORBITAL SECOND HAND

SIGNED JACOB & CO, TOURBILLON GRAVITATIONNEL TROIS AXES, ASTRONOMIA SKY MODEL, NO. 15/18, CIRCA 2017

Details
JACOB & CO. A VERY FINE, EXTREMELY RARE AND IMPRESSIVE 18K PINK GOLD AND ORANGE SAPPHIRE-SET LIMITED EDITION GRAVITATIONAL TRIPLE AXIS TOURBILLON WRISTWATCH WITH SKY INDICATOR OF THE CELESTIAL PANORAMA, MONTH, DAY/NIGHT INDICATOR AND ORBITAL SECOND HAND

SIGNED JACOB & CO, TOURBILLON GRAVITATIONNEL TROIS AXES, ASTRONOMIA SKY MODEL, NO. 15/18, CIRCA 2017
Movement: Cal. JCAM11, manual, 42 jewels, signed
Dial: Tourbillon rotating on 3 axes, lacquered hand-engraved titanium globe rotates fully in 24 hours to displaying day/night, satellite shaped orbital seconds rotates in 60 seconds, celestial dial rotates fully in 1 sidereal year, oval star indicator showing the portion of stars visible from northern hemisphere, month indicator on the sides of celestial dial, signed
Case: Back secured by 6 screws, 47 mm. diam., signed
With: 18k pink gold and titanium Jacob & Co deployant clasp, undated Certificate of Authenticity, associated Jacob & Co. presentation box and outer packaging
Special Notice

> Some watches are pictured with straps made of endangered or protected animal materials such as alligator or crocodile. These endangered species straps are shown for display purposes only and are not for sale. Christie’s will remove and retain the strap prior to shipment from the sale site. At some sale sites, Christie’s may, at its discretion, make the displayed endangered species strap available to the buyer of the lot free of charge if collected in person from the sale site within 1 year of the date of the sale. Please check with the department for details on a particular lot. > Prospective purchasers are advised that several countries prohibit the importation of property containing materials from endangered species, including but not limited to coral, ivory, tortoiseshell and crocodile. Accordingly, prospective purchasers should familiarize themselves with relevant customs regulations prior to bidding if they intend to import this lot into another country.
Post Lot Text
An extraordinary feat of watchmaking, design and imagination, the Astronomia Sky is both a breathtakingly beautiful mechanical work of art and a serious complicated watch - a miniature universe for the wrist. It is the first ever watch to feature a three-dimensional sidereal display.

Made in a limited edition of only 18 pieces, the impressive 47 mm. diameter pink gold case is designed with sapphire crystal glazed sides and a unique domed sapphire crystal to display the mechanism within to maximum effect.

The blue grade 5 titanium dial with 18k gold hand-engraved and applied stars and zodiacal symbols represents the celestial vault through the zodiac signs and makes one rotation per sidereal year, in the centre is a lacquered hand-engraved titanium globe rotating on two axes inside a tinted half-domed sapphire to show night and day. The first axis makes one rotation in 24 hours and on the second axis it travels across the celestial vault in 20 minutes. The oval sky indication shows the stars visible from the northern hemisphere and makes one rotation per sidereal day. The moon, also rotating on two axes, is represented by a dazzling Jacob-cut orange sapphire, weighing one carat it has an incredible 288 facets.

The manual winding calibre JCAM11 movement with differential gear system is a marvel of mathematics and engineering, with hand-angled and polished plates it features a Triple Axis Gravitational Tourbillon. This mesmerising and rarely seen complication rotates on its first axis every 60 seconds, the second axis every 5 minutes and on its third or central axis the tourbillon travels across the celestial vault every 20 minutes.

Sidereal Time
Viewed from the same location, a star seen at one position in the sky will be seen at the same position on another night at the same sidereal time. This is similar to how the time kept by a sundial can be used to find the location of the Sun. Just as the Sun and Moon appear to rise in the east and set in the west due to the rotation of Earth, so do the stars. Both solar time and sidereal time make use of the regularity of Earth's rotation about its polar axis, solar time following the Sun while sidereal time roughly follows the stars. A Sidereal Day= 23.5640916 hours. One sidereal year is the time it takes the earth to orbit the sun with respect to the fixed stars.

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Yvonne Yu
Yvonne Yu

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