Saturday, May 27, 2017

IWC Schaffhausen Portofino Hand-Wound Tourbillon Rétrograde (Ref. IW516501)

The Portofino Hand-Wound Tourbillon Rétrograde (Ref. IW516501) is the first IWC Portofino model to feature a tourbillon, with the balance, pallet and escape wheel mounted in a cage that rotates around its own axis once every minute. This constant rotation helps to counteract the pull of gravity so that it does not adversely affect the watch’s rate and accuracy.
The newly developed hacking tourbillon enables the watch to be set with down-to-the-second accuracy. IWC has also revised the geometry of the pallet and the escape wheel, plus it has manufactured the components using diamond-coated silicon, thus reducing friction. This contributes substantially to the power reserve of eight days achieved with the IWC hand-wound 59900 calibre.
A retrograde date display and power reserve display accompany the flying minute tourbillon on the dial. The case, with a diameter of 45 millimetres, is made of 18-carat red gold. The dial is silver-plated and the hands are gold-plated; the appliqués are made of solid gold. The sapphire-glass back provides a view of the calibre, which is adorned with Geneva stripes. The Portofino Hand-Wound Tourbillon Rétrograde is fitted with an exquisitely finished alligator leather strap by Santoni.

Technical details
Model: Portofino Hand-Wound Tourbillon Rétrograde Ref. IW516501

Functions
Power reserve display
Retrograde date display
Flying hacking minute tourbillon at “6 o’clock”

Movement
IWC-manufactured calibre 59900 Mechanical movement
Breguet spring
Frequency: 28,800 A/h | 4 Hz
Jewels: 40
Power reserve: 8 days (192 h)
Winding: Hand-wound

Case, dial and strap
18-carat red gold case
Diameter: 45 mm
Height: 14 mm
Glass Sapphire, arched edge, antireflective coating on both sides
See-through sapphire-glass back
Water-resistant 3 bar
Silver-plated dial, gold-plated hands, solid gold appliqués
Dark brown alligator leather strap by Santoni

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