Product Title: Jacob & Co. Astronomia Sky Limited Edition 47mm AT110.31.AA.WD.A
This limited edition timepiece is a true masterpiece, with only 18 pieces available worldwide. Crafted from 18k blackened gold and sapphire crystal, the case measures 47mm in size and 25mm in thickness. The unique design features sapphire apertures on the sides and 18k black gold lift-out rotating 'bows' for winding and time-setting. The caseback also includes two wheels for synchronization of the sidereal time, with a celestial dial and oval sky indicator.
The crystal is a domed sapphire with anti-reflective treatment, and the watch is water resistant up to 30 meters (100 feet). The celestial dial is made of black grade 5 titanium and features 18k gold hand-engraved and applied stars and zodiacal signs. The hour and minute subdial is also made of titanium and features hand angled and polished lacquered indexes.
The differential gear system is hand finished in blue, and the watch comes with a black Louisiana alligator leather strap and 18k rose gold folding buckle. The sidereal display is a unique feature, with the celestial dial covering the internal surface of the case and representing the celestial vault through zodiac signs. It rotates counter clockwise in 1 sidereal year.
The oval sky indication shows the portion of stars visible from the northern hemisphere and rotates clockwise in 1 sidereal day above the celestial vault. The month indication is located on the sides of the celestial dial, with an index at the 6 o'clock position. The day and night indication is represented by a lacquered hand-engraved titanium globe, rotating on two axes.
The gravitational triple axis tourbillon is a stunning feature, rotating on three axes in 60 seconds, 5 minutes, and a central axis traveling across the celestial vault in 20 minutes. The orbital second indication also rotates on two axes, with a central axis traveling across the celestial vault in 20 minutes. The open worked titanium wheel and hand indicate the seconds.
The hour and minute indication is made possible by a patented differential system, rotating on a central axis and traveling across the celestial vault in 20 minutes. The Jacob cut moon is a weight of 1 carat and
