Hero Image

Astronomia Maestro

Astronomia Maestro


The Astronomia is the epitome of 21st century ultra-high-end watchmaking and a globally recognized symbol of Jacob & Co watchmaking expertise. A world-first both in the boldness of its unprecedented concept and its entirely mechanical construction, the Astronomia has gone beyond impressive horological achievements and has been regarded as an outstanding multidisciplinary engineering achievement.

Expanding the Astronomia universe with the minute repeater carillon chiming complication - one of the most elaborate mechanisms ever conceived in the history of watchmaking -, the Astronomia Maestro is among the most complex iterations of Astronomia we have ever created. Its iconic four-arm movement construction sees the addition of a fifth element with the date and phase of the moon display, moving the time display to the very center of the piece. A spectacular, three-dimensional and absolutely unparalleled achievement in horology, the Astronomia Maestro amazes on its every level.

Exclusive Astronomia Caliber main image

Exclusive Astronomia Caliber

The four arms of the Astronomia Maestro carry the gravitational triple-axis tourbillon timekeeping organ of the watch, Planet Earth crafted from a magnesium globe in hand-painted blue, an all-new date and moon-phase display featuring a new, bi-color Jacob-Cut® 1-carat diamond, as well as a miniature, hand-crafted astronaut that spins through the space inside the Astronomia. This four-arm assembly completes a rotation around the center of the watch and over a spectacular backdrop in 10 minutes. Another astounding feature of the Astronomia Maestro is how each pair of opposing arms are perfectly calculated counterweights of one another - a testament to peerless materials engineering and watch movement design. By having equal weights on these opposing arms, its axles are relieved from strain and increased pull, as the movement takes up different orientations in space.

Astronomia Maestro Triple Axis Tourbillon

Triple-Axis Tourbillon

Whereas the tourbillon was originally invented to be a single-axis, rotating cage to carry the regulating organ of a mechanical pocket watch for improved timekeeping performance, the Astronomia Maestro brings this 224-year-old invention to breathtaking levels of modern refinement and complexity.

The triple-axis tourbillon of the Astronomia Maestro is at the forefront of ultra-high-end watchmaking. Its delicately decorated cages encapsulate the balance wheel, hairspring, escape wheel and a number of other crucially important components. Characterized by its openworked surroundings, this outstanding tourbillon rotates on three axes simultaneously. It is a constellation of superbly finished components that, when assembled and fine-tuned expertly, allows the JCFM06 Caliber to keep accurate time throughout its 48-hour power reserve.

A full rotation on the 1st axis takes exactly 60 seconds, as a nod towards the traditional single-axis tourbillon. The 2nd axis of rotation requires 90 seconds to complete, while the 3rd axis of rotation is made possible by the 10-minute, four-arm rotating platform of the Astronomia Maestro. This makes for a bold new look at how tourbillons can function, when engineered with cutting-edge, ultra-modern technologies and timeless horological heritage in mind.

a watch on a table

Astronomia Maestro Video


Surrounding the half-black/half-white Jacob-cut diamond moon phase is a blued titanium Celestial Vault with the constellations. Circling this is an adjustable date track, with a pointer indicated today's date.

Astronomia Maestro Miniature Astronaut On Orbit

Miniature Astronaut

Expanding upon its inspired ties to outer space, the Astronomia Maestro has a hand-painted, miniature astronaut fixed to one of the four rotating arms of its Manufacture JCFM06 Caliber. The astronaut weighs just 0.2 grams or 0.07 ounces, as it orbits through the open space inside the Astronomia Maestro. It orbits along with the three other arms of the caliber, taking 10 minutes to pass over the Milky Way aventurine backdrop, all the while rotating around its own axis once every 40 seconds.

Astronomia Maestro Minute Repeater Carillon

Minute Repeater Carillon

The Minute Repeater Carillon is widely and historically referenced among the most challenging complications ever conceived in fine watchmaking. As a chiming mechanism, on demand of its owner, the minute repeater of the Astronomia Maestro begins to strike the hours, quarters and minutes with its three hammers and gongs, making for a brilliantly refined, musical interpretation of time.

As a first in watchmaking, the Astronomia Maestro's three gongs criss-cross above a hand-painted Milky Way aventurine dial. The gongs are struck by their respective hammers when the slider, set into the left side of the case, is pulled to power up and initiate the minute repeater carillon complication. The sound is clear and loud, the chimes are accurate and painstakingly calibrated, making the Manufacture JCFM06 caliber a true Maestro in haute horlogerie.

Astronomia Maestro Moon Phase Indication

Jacob-Cut® Diamond-Set Phase Of The Moon Indication

The moon phase display of the Astronomia Maestro uses a 288-facet, 1-carat, Jacob-Cut® diamond, specially composed of a white and a black diamond half-sphere. The two sides represent the full moon, and new moon, respectively. Crafting a 288-facet, exclusive Jacob-Cut® diamond of 1-carat weight, a 4-carat stone is to be used, due to the outstanding and unprecedented complexity of the cut itself.

a close up of a motorcycle


The globe is made of blue-lacquered magnesium with rose gold continents to ensure consistency in weight, as all four satellites have to weigh exactly the same. The globe rotates on itself in 30 seconds, while traveling around the dial in 10 minutes.

Astronomia Maestro Case & Crystal

Case & Crystal

The Astronomia Maestro's case measures 50 millimeters in diameter and 26 millimeters thick between the highest point of its specially curved front sapphire crystal and the lowest point of its case. Its 18K Rose Gold case holds a single-piece sapphire crystal window around its periphery, allowing for unhindered viewing of the spectacular caliber inside. The airy, spacious look and feel of the Astronomia Maestro is further enhanced by the openworked lugs, a minute, yet important detail that drives ones vision towards the face of the timepiece.

Astronomia Maestro Dial & Hands

Dial & Hands

Time is displayed by the central-mounted sub-dial, sitting atop the hand-wound Manufacture JCFM06 caliber. Crafted from a combination of aluminum and titanium and designed with an openworked structure, the time display of the Astronomia Maestro was designed to be as light as possible, given its unprecedented position, high above the movement. The time is indicated by Gun Blue metallic finished hands and applied and curved indices.


Iconic triple-axis tourbillon movement

Minute repeater with exposed carillon gongs

Unique 18k rose gold and sapphire crystal case

Crown-less design with winding and setting lift-out bows on the solid 18K rose gold case back

The blue-lacquered magnesium globe rotates on itself in 40 seconds

The hand-painted astronaut rotates on itself in 40 seconds 288-facet Jacob-cut half-white/half-white diamond moon phase display

Date display

Hand-painted galaxy dial with planets

Technical Specifications


MOVEMENT: Caliber: Manufacture Jacob & Co. Manual Winding JCFM06; Diameter: 34.0mm; Height: 19.9mm; Components: 608; Material: Titanium, steel and Maillechort; Power Reserve: 48-Hours; Frequency: 21'600 vib/h (3 Hz); Jewels: 55; Finishing: Plate and Bridges: Angled, Shot blasted or Polished, Circular Graining, Polished Sink; Screws: Angled Slot, Polished Head; Barrel: Circular Graining; Pinions: Maret polishing.

FUNCTIONS: Hours and Minutes, Minute Repeater Carillon with elevated Spiral Gongs, Moon Phase and Date.

SYSTEM: Vertical Movement with 4 Arms, Full Revolution in 10 min around a Central Axis; Gravitational Triple Axis Tourbillon, 1st Cage rotating in 60 sec and 2nd Cage in 90 sec; Lacquered Magnesium Globe rotating in 40 sec; Weight: 0.2g; Hand-painted Astronaut rotating in 40 sec; Weight: 0.2g; Moon Phase and Date: 2 Half Sphere Jacob Cut® Diamonds (1 carat total), Hand- painted dial; Minute Repeater striking: Hours, 15 minutes and Minutes Carillon Gong with 3 Hammers at 6 O'clock; First in Watchmaking: the Three Gongs Crisscross above the Plate, into a clearly Visible Spiral combined with a Triple Axis Tourbillon; Hours Gong Diameter: 44.7mm; 15-Minutes Gong Diameter: 43.5mm; Minutes Gong Diameter: 44.1mm.

CASE: Diameter: 50mm; Height: 26mm; Material: 18K Rose Gold; Sapphire Apertures on Sides Front case: Hand-painted Milky Way with planets on Aventurine dial; Case Back: Winding, Time- Setting, Moon Phase and Date setting via rotating Bows; Crystal: Unique Domed Sapphire withAnti-Refl ective Treatment; Water resistance: 10m.

DIAL & HANDS: Dial: Aluminum and Titanium, Lacquered Indexes; Hands: Gun Blue Finish.

STRAP & CLASP: Alligator Clasp: 18K Rose Gold Folding Buckle.



If you have any questions, queries or comments, please feel free to get in touch and our team will be delighted to help you.

Contact Us

Flagship Boutique
/ Corporate Office

48 East 57 Street
New York, NY 10022
+1 (212) 719-5887
Jacob & Co

Join Our Mailing List