Remember when IWC dropped a collection of Jubilee editions to mark its 150th anniversary in 2018? Among those was a timepiece that for the time in the brand’s history combined a tourbillon and a perpetual calendar. This was the Portugieser Perpetual Calendar Tourbillon "150 YEARS" edition. Now,  IWC introduces this powerhouse duo in the revamped Portugieser Collection with two new limited references. Meet the new Portugieser Perpetual Calendar Tourbillon limited editions.

Ref. IW504504 in Armor Gold and Ref.504505 in Platinum

The two references, one of which is a boutique edition (Ref. IW504504) is presented in 18K Armor Gold, are both limited to 50 pieces each. Armor Gold is IWC’s proprietary version of 5N red gold. To create Armor Gold, the microstructure of the gold alloy is altered during the manufacturing process which results in a material, which IWC claims, is significantly harder and five to ten times as wear-resistant as conventional 5N gold. The second (Ref. IW504505) will be available in platinum.

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The boutique edition has the characteristic blue dial, gold-plated hands, 18-carat gold appliques, and blue braided calf leather strap. The platinum version has a silver-plated dial, rhodium-plated hands and appliques, blue alligator leather strap by Santoni.

The tourbillon at 12 draws the eye instantly

The case dimensions are the same as the Jubilee edition watch (ref. IW504501). The width is 45 mm and the thickness is 15.3 mm. It is water-resistant to 30 meters, and fitted with a box-like sapphire crystal atop the dial and a sapphire crystal caseback. The real estate on the dial is utilized well considering the amount of information there is to display here. Starting with a tourbillon which appears via a cut-out in the dial at 12 o’ clock. The days of the week are indicated in a sub-dial at 9, the date is indicated in a sub-dial at 3, and the moon-phase indication is positioned at 6 o’ clock with the month arranged along the fringes of this sub-dial. The characteristic four digit year display is seen just below 8 o’ clock.

Caliber 51950 is based on the existing Tourbillon Caliber 51900

Caliber 51950 is based on IWC’s existing tourbillon Caliber 51900, which powers IWC’s “Tourbillon Mystère” watches, and adds perpetual calendar functionality. The tourbillon alone is made up of 82 parts and weighs only 0.635 grams. To make it visible at 12 o’clock, the calendar module’s advance ring was opened, and the moon phase integrated into the month display at 6 o’clock. With its 18-carat gold rotor, the automatic winding system builds up a seven-day power reserve.

The Platinum version (Ref. IW504505) is priced at CHF133,000 (Approx. AED 491,000 based on current exchange rates, but they may vary) while the boutique edition (Ref. IW504504) is priced at CHF115,000 (Approx. AED425,000 on current exchange rates).