An universe at your wrist – Astronomia Sky by Jacob&Co

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“As a sailor heading toward the seas driven by the celestial vault, I found my star: the Astronomia Sky” – Jacob Arabo, founder of Jacob & Co.


Astronomia Sky by Jacob&Co
Jacob&Co has secured its place between the Haute Horlogerie players with the Grand Complication Masterpieces collection. The watches are incredibly beautiful as timepieces and jewellery pieces.
I wrote an article about the Astronomia Tourbillon, on the first day of this year, as a celebration of the last year and a good start of this one. This year, at BaselWorld, I had the chance to admire the new Astronomia Sky – a complicated piece of machinery with an incredible look and a lovely looking astronomic complication.
Even if the watch has quite a big case of 47mm diameter and a thickness of 25mm, the miniature universe looks amazing on the wrist. The 18K rose gold case uses a sapphire ring on the sides wich gives a good view of the movement and the celestial elements.
The case back is 18K rose gold with lift out rotating “bows” for hand winding and time-setting. Other two subtle wheels on the case back’s sides are used for synchronisation of the sidereal time: Celestial Dial and Oval Sky indicator. Between the slender, open lugs, on the wearer side is deeply engraved the Jacob&Co name and a tip used for the month indication.
The out of this world timepiece is covered on top with a domed sapphire crystal with anti-reflective coating and it has 30m/ 3atm water resistance.


Astronomia Sky by Jacob&Co

The Astronomia Sky Tourbillon has a beautiful dial comprised of a base celestial dial, covering the internal surface of the inside case, manufactured from a grade 5 blue Titanium with 18K gold hand-engraved and applied lovely stars and zodiacal signs constellations visible in the northern hemisphere. This needs one sidereal year to make a full rotation, showing, on the side, the 12 months indication. The stars visibility oval indicator, in gold, needs one sidereal day / 23.5640916 hours, to make a complete dial rotation.
The everyday time indication is done on a hand angled and polished titanium subdial, with lacquered indexes, that uses a differential gear system to keep it always in the correct viewer position and display the right time using hand finished blue minutes and hours hands.

Astronomia Sky by Jacob&Co

In the centre of the dial there is a hand-engraved titanium globe, beautifully lacquered, and rotating on 2 axes: – a full rotation on its own axe in 24 hours – representing Earth’s revolution and a 20 minutes central axe, travelling across the celestial vault – a complete rotation of the entire movement.
Over the globe, there is a tinted half-domed sapphire, symbolising night and day and used as a 24 hours indication.
15 minutes clockwise from the time subdial there is the Orbital seconds’ indication which rotates on the central axe in 20 minutes and has a fixed hand indicating of the seconds on the open worked titanium wheel. On the other side of the Orbital seconds, there is the 1 carat, 288 facets patented Jacob-cut Orange sapphire which offers a spectacular view.
I must mention that all the elements are perfect weighted and balanced to have a symmetrical load on all the axes.
The spectacular Jacob&Co gravitational triple-axis tourbillon makes a rotation on the first axis in one minute, on the second axis of 5 minutes and on the third axis, together with all the elements, in 20 minutes.
This Astronomia Sky by Jacob&Co limited series of 18 pieces has a twin in white gold.

Astronomia Sky by Jacob&Co

These spectacular timepieces come with an alligator leather strap and gold folding buckle.
Setting the Astronomia Sky is very simple due to the back “bows” and wheels. More explanation can be seen in the video bellow. The dynamic movement of the entire construction with a rotation in 20 minutes makes this watch very attractive at every point in time.
The movement is visible from the top and the sides: a hand wound 40mm diameter caliber with a height of 17.15 mm due to multiple elements. This movement uses 42 jewels from a total of 395 components and has a heart beating with a slow 3Hz or 21,600vph and a 60h power reserve. The main material used is titanium which is very light, resistant but very hard to work with. Still, the finishes present will make blush any steel or other alloy movements: the main plate and bridges have drawn flanks (etirage) and hand bevelled and polished edges with a circular graining (perlage) finish, polished sink and screws. The entire movement is a feast for the eyes.


I would like to thank Jacob&Co for all the information, images and videos.
Please visit the Jacob&Co Website for more information or visit one of the Retailers.

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