Jacob & Co. welcomes a new masterpiece to its phenomenally successful Astronomia collection. Having used the extremely complicated minute repeater in other collections, Arabo, founder of Jacob & Co. decided to include a minute repeater with carillon gongs into the already super complicated Astronomia.
Minute repeaters are the most prized complications by collectors and they are among the most difficult complications for watchmakers to conceive. Only a handful of watchmaking houses can successfully create a minute repeater, and when combined with other high complications, like the Astronomia’s triple axis tourbillon and rotating structures, the Astronomia Maestro is a true feat of watchmaking know-how, one that took more than three years of development time before it was ready to be released this year.
When actuated, the three spiral gongs of Astronomia Maestro’s minute repeater carillon chime out the hours, the 15-minute periods and the minutes, on display for all to see, and, thanks to the sapphire crystal case, the sound is fantastic.
The large sapphire crystal case has been a consistent design element of Jacob & Co.’s Astronomia collection since the introduction of the first Astronomia in 2014. The transparency of the case allows the movement of the gravitational triple axis tourbillon to be clearly visible from multiple angles, and the three elevated spiral gongs of the minute repeater carillon are clearly visible in the six o’clock position.
At the heart of the Astronomia Maestro lies the superior timepiece craftsmanship for which Jacob & Co. is renowned. A triple axis tourbillon counteracts the effects of terrestrial gravitation on the caliber’s mobile components as the tourbillon cage rotates in 60 seconds and completes a revolution over itself in 90 seconds, while the entire tourbillon covers a full revolution around the watch’s central axis in 10 minutes. The 1-carat, 288-facet Jacob Cut® diamond, the magnesium-lacquered blue globe, the hand-painted astronaut rotate on themselves in 40 seconds, and the moon phase and date, including two half-sphere Jacob-cut diamonds (one carat total) travel with the tourbillon around the dial.
The background to this mechanical mastery is pure aventurine, making it look like a deep blue starry sky, with a hand-painted Milky Way and planets as details.
Model: Astronomia Maestro – Gravitational Triple Axis Tourbillon Minute Repeater Carillon
Caliber: Manufacture Jacob&Co. Manual Winding JCFM06
Diameter: 34.0mm; Height: 19.9mm; Components: 608
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 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
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: 50-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.
Diameter: 50mm; Height: 26mm; Material: 18K Rose Gold; Sapphire Apertures on Sides
Case Back: Winding, Time-Setting, Moon Phase and Date setting via rotating Bows
Crystal: Unique Domed Sapphire with Anti-Reﬂective Treatment; Water resistance: 30m
Aluminum and Titanium, Lacquered Indexes; Hands: Gun Blue Finish
Clasp: 18K Rose Gold Folding Buckle
18 Pieces; Individually Numbered Pieces