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        JACOB & CO. ASTRONOMIA TOURBILLON SKY SAPPHIRE MARS LIMITED EDITION 47MM

        Our Price :

        د.إ249,760.00

        Please note that prices and availability may change and are not guaranteed until confirmed.

        Brand: Jacob & Co.
        Model: Astronomia
        Reference: AT113.40.AA.AA.A

        Description

        Limited edition of 18 pieces.

        Case:
        Diameter: 47 mm.
        Thickness: 25 mm.
        Material: 18k rose gold.
        Sapphire.
        Case back: 18k rose gold.
        Bows: 18k rose gold lift-out rotating “bows” for winding, time-setting.
        Two wheels on the case back side for synchronization of the sidereal time: celestial dial and oval sky indicator.
        Crystal: unique domed sapphire with anti-reflective treatment.
        Water resistance 30 meters.

        Dial and 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.
        Blued Jacob & co. designed hands.

        Movement:
        Calibre manufacture Jacob & co. manual winding JCAM41.
        Diameter: 42 mm.
        Height: 21.7 mm.
        Components: 502.
        Material: titanium.
        Jewels: 67.
        System: triple axis tourbillon.
        Power reserve of 60 hours.
        Frequency: 21’600 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 year 1.
        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).
        Oval sky indication: showing the portion of the stars visible from the northern hemisphere, a full rotation in 1 sidereal day 2 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: 1st axis: in 60 seconds, 2nd axis: in 5 minutes, 3rd axis: central axe, travelling across the celestial vault in 20 minutes.

        Satellite and mars animation:
        Rotating on 2 axes: 1st axis: in 60 seconds, 2nd axis: central axe, travelling across the celestial vault in 20 minutes.
        Hour and minute indication.
        Patented differential system rotating on a central axe, travelling across the celestial vault in 20 minutes.

        The Jacob cut moon:
        288 facets diamond patented Jacob cut (1ct.) rotating on itself in 60 seconds.

        Strap and clasp:
        Alligator leather.
        18k rose gold folding buckle.

        Brand

        Jacob & Co.

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