2012/01/19 - IWC Portuguese Sidérale Scafusia a unique masterpiece

The Portuguese Sidérale Scafusia is the first watch from IWC to feature a patented constant-force tourbillon together with many other complications and individually calculated astronomical displays. Every watch is made on special request and will be unmistakably unique.

A Unique Masterpiece

he design of the dial is in the same characteristic style as that of the entire IWC Portuguese watch family. Apart from standard time (or solar time), it also has a display at “12 o’clock” showing sidereal time (or star time), which is vital to astronomers. The newly developed constant-force tourbillon, which combines a tourbillon with a constant-force mechanism, guarantees a regular and precise rate for a period of at least 48 hours. The 90-hour scale of the power reserve display at “4.30” underscores the enormous power generated by the two barrels.

TAILORING THE NIGHT SKY 
CUSTOMIZED TO THE OWNER’S SPECIFICATIONS

On the rear side of the watch, the night sky disc reveals the full glory of the star-studded heavens. A location chosen by the customer provides the basis of the calculations for the celestial chart and the astronomical displays. Realistically, it is possible to show around 500 to 1,000 stars. The sky disc rotates in a clockwise or anticlockwise direction, depending on whether the chosen geographic location is in the northern or southern hemisphere. The horizon, identifiable as a yellow ellipse, shows the movements of the stars and the section of the sky currently visible in the real night sky above the chosen coordinates. These coordinates indicate the precise location for which the planisphere has been calculated. The red circle projects the apparent orbit of the Sun in the course of a year on the celestial sphere (ecliptic). The dashed grey circle indicates the celestial equator that separates the northern and southern hemispheres. The red arrow with the dot shows solar time on the outer ring of the 24-hour display while the yellow arrow with the star shows sidereal time, likewise on the inner ring. The two red triangle hands at the edge show the current sunrise and sunset times at the chosen location. The perpetual calendar displays the current date as the number of the day of the year (absolute day). The 1st of January, then, is day 1, the 31st of December day 365, or 366 in a leap year.

MAKE IT YOUR OWN

THERE ARE OVER 200 WAYS TO CUSTOMIZE YOUR MASTERPIECE

As part of its special service, IWC Schaffhausen enables customers to personalize the Portuguese Sidérale Scafusia wristwatch with countless different combinations of features. Taken together, the choice of materials for the case, the five different colours for the dial, the various colours for the appliqués and straps and the material used for the straps, result in over 200 different design options. IWC is only too pleased to honour special requests in the interests of exclusivity.
The case is made of precious metals such as platinum, 18-carat white gold or 18-carat red gold, while the straps are manufactured from the finest alligator leather or equus-hide.

The Portuguese Sidérale Scafusia is personally presented to its new owner in a top-quality watch case. It contains a removable casket, covered in alligator leather, in which the watch can be safely stored. Integrated into the case is an automatic winder, which was developed especially for this watch with IWC’s engineers. It winds the watch independently once a day via the crown. The large celestial chart on the inside of the watch case lid is, like the watch’s own celestial chart, individually calculated.



Technical specifications

Variations
Taken together, the choice of materials for the case, the five different colours for the dial, the various colours for the appliqués and straps and the material used for the straps, result in over 200 different design options.

Ref. : 5041

Watch Front 
Case in platinum, 18-carat red gold or 18-carat white gold - Mechanical movement - Hand-wound - 2 barrels - Breguet spring - 96-hour power - reserve when fully wound - Power reserve display at 4.30 - Constant-force tourbillon and small seconds at 9 o’clock - Sidereal time at 12 o’clock - Sapphire glass, convex, antireflective on both sides

Watch Back 
Perpetual calendar with leap year display and absolute day of the year - Celestial chart showing horizon, ecliptic and celestial equator - Indication for day, night and twilight - Display for sunrise and sunset - Coordinates of chosen location - Sapphire glass - Case height 17.5 mm - Diameter 46 mm