Astronomia Sky Sapphire

Market Cross Jewellers - Authorised Retailer of Jacob & Co.

Product Reference: AT113.40.AA.AA.A

TECHNICAL SPECIFICATIONS

Movement:
Caliber: Manufacture Jacob&Co. Manual Winding JCAM41;
Diameter: 42mm;
Height: 21.7mm;
Components: 502;
Material: Titanium;
Jewels: 67;
System: Triple Axis Tourbillon;
Power Reserve: 60-Hours;
Frequency: 21600 vib/h (3 Hz);

Functions:
SIDEREAL DISPLAY
Celestial Dial covering the internal surface of the inside case,
representing the celestial vault through zodiac signs
A full rotation in 1 sidereal year1.
Oval sky indication: Showing the portion of the stars visible from the
northern hemisphere, a full rotation in 1 sidereal day2 above the
celestial vault.
Month indication: 12 months on sides of the celestial dial.

DAY AND NIGHT INDICATION
Lacquered hand-engraved titanium globe, rotating on itself in 24
hours, inside a tinted half-domed sapphire, symbolizing night and
day.

TRIPLE AXIS TOURBILLON
Rotating on 3 axes:
1 st Axis: in 60 seconds,
2 nd Axis: in 5 minutes,
3 rd Axis: Central Axe, travelling across the celestial vault in 20
minutes.

SATELLITE AND MARS ANIMATION
Rotating on 2 axes:
1 st Axis: in 60 seconds,
2 nd Axis: Central Axe, travelling across the celestial vault in 20 minutes

HOUR & MINUTE INDICATION
Patented differential system rotating on a Central Axe, travelling
across the celestial vault in 20 minutes;
1 One sidereal year is the time it takes the earth to orbit the sun.
2 Sidereal Day= 23.5640916 hours, it is the time it takes the earth to rotate on its axis (relative to vernal equinox).

THE JACOB CUT MOON
288 Facets Diamond Patented Jacob Cut (1ct.) rotating on itself in 60 seconds.

Case:
Diameter: 47mm;
Thickness: 25mm;
Material: 18K Rose Gold; Sapphire
Case Back: 18K Rose Gold;
Bows: 18K Rose Gold lift-out Rotating bows for Winding, Time-
Setting; two Wheel on Caseback Sides for Synchronization of the
Sidereal Time: Celestial Dial and Oval Sky Indicator.
Crystal: Unique Domed Sapphire with Anti-Reflective Treatment;
Water resistance: 30m (3atm)

Dial & Hands:
Celestial Dial: Blue Grade 5 Titanium, 18K Gold hand-engraved and applied stars and
zodiacal signs;
Hour and Minute Subdial:
Titanium, Hand Angled and Polished, Lacquered Indexes; Differential
Gear System;
Hands: Blued Jacob&Co designed hands

Strap & Clasp: Alligator; 18K Rose Gold Folding Buckle.

Limited Edition: 18 pieces