The Astronomia Tourbillon series launched by Jacob & Co. at the 2018 Basel International Watch and Jewellery Show successfully combines two haute horological complications-the brand’s acclaimed gravity three-axis tourbillon movement and a high pitch gong Minute repeater watch tourbillon-in addition to basic timing functions and spectacular astronomical display.

This complex and large watch uses a large 50mm rose gold case with a sapphire hole on the side. It was created by Jacob & Co. founder Jacob Arabo in collaboration with watchmaker Luca Soprana. The two masters in their respective fields have jointly conceived and developed the entire range of astronomy series movements (including the original astronomy first vertical self-winding movement, which continuously rotates around the central axis and the lateral real-time display of astronomy Sky ). In the past four years, it took a total of two years to rebirth astronomers. Due to the complexity of its composition and the complexity of its design, Astronomia Maestro is a limited edition, offering only 18 individually numbered works.

The complexity of the highly complex minute repeater mechanism has been mastered by only a few watchmakers around the world, and the overall sophistication of the masters of astronomy adds to the icing on the cake. The minute repeater of the Astronomia Maestro is equipped with a patented fusée barrel with a ratchet and pawl system, which is also unique in watchmaking: the cathedral clock on the plate of three gongs The melody of the piano is interwoven into a clearly visible spiral.

In order to make this seemingly impossible mechanism a reality, many elements of astronomers must be redesigned. The unique concept of the astronomical movement and the available space in its sapphire dome case enable Arabo and Soprana to enhance tuning capabilities. Maestro’s minute repeater adjusts the hours, quarters and minutes from low to high, and combines three hammers to simplify the aural indication of time. Together, these three hammers produced the harmonious melody of the “Cathedral Carillon” with the best and purest tones.

The sapphire dome and sides of the exact replica watches provide clear sound. The fast rotating barrel provides the required energy, and the minute repeater function is ensured through a patented system that protects the mechanical device from any handling accidents.

In addition to the acoustic performance of the minute repeater tourbillon, the master astronomer is also considered the most advanced timepiece because of its gravitational three-axis tourbillon. Although originally designed to counteract the effects of gravity on the moving parts of the movement, the system improves efficiency by rotating on three axes: the cage of the escapement rotates around the balance wheel axis in 60 seconds and in 2.5 minutes The internal rotation is completed, and the entire tourbillon performs a complete cycle around the central axis of the watch within 10 minutes. The triple rotation ensures the ultimate precision of this exclusive Jacob & Co. JCEM03 movement.

In order to highlight the main functions of the watch, the dial of the observatory indicates the hours and minutes. It is located at the heart of the four axes, rather than the typical position of one of them. In this way, the tip of the dial, which is usually in the astronomy collection, was released in the master, and a new function was discovered. It has a moon phase that revolves around the movement, rotating in 10 minutes and 31 days later. When displaying the date through the traditional index, the moon phases are displayed by rotating 288 Jacob-cut diamonds (black and half white, white). http://www.chrono4usale.com

After arriving at the astronomical display, under the sapphire dome similar to the porthole of an interplanetary spacecraft, people can move around the timepiece along the earth. The magnesium paint ball is placed on one of the shafts and can rotate within 30 seconds while rotating around the main shaft. Parallel to this movement is the sculpture of the astronaut, which floats weightlessly in the astronomical universe. The miniature sculpture weighs only 0.2 grams, can spin within 30 seconds, and rotate around the dial within 10 minutes.

Technical details

Model: Astronomia Maestro

Reference: AM500.40.AC.SD.B

Caliber: Manufacture Jacob&Co. Manual Winding JCEM03
Diameter: 39.7mm; Height: 19.6mm; Components: 601
Material: Titanium and Maillechort
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 2.5 min
• Lacquered Magnesium Globe rotating in 30 sec; Weight: 0.3g
• Hand-Made Magnesium and Hand-Painted Astronaut rotating in 30 sec; Weight: 0.3g
• Moon Phase and Date, 2 Half Sphere Jacob Cut® Diamonds:
1 Carat Total
Minute Repeater striking: Hours, 15 minutes and Minutes (Music Notes: Do, Re, Mi), Carillon Gong with 3
Hammers at 6 O’clock
Patented Double Mechanical Safety℗ Feature During a Chiming Sequence
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
Power Reserve: 60-Hours; Frequency: 21’600 vib/h (3 Hz); Jewels: 56
Finishing: Plate and Bridges: Hand Angled and Polished, Flank Draw, Circular Graining, Polished Sink; Hand Polished Screws; Barrel: Circular Graining; Pinions: Conical Pinions, 4 Mechanical Ball Bearing Devices; Flat Balance Spring

Case, dial and strap
Diameter: 50mm; Height: 26mm; Material: 18K Rose Gold; Sapphire Apertures on Sides
Case Back: Double Case Back to Enhance the Sound, Winding and Time-Setting via rotating Bows, Rotating
Wheel to set the Moon Phase
Crystal: Unique Domed Sapphire with Anti-Reflective Treatment
Water resistance: 30m
Dial: Aluminum and Titanium, Lacquered Indexes; Hands: Gun Blue Finish
Strap: Alligator
Clasp: 18K Rose Gold Folding Buckle