The Portuguese Tourbillon Mystère Rétrograde is a stunning timepiece with a flying tourbillon and retrograde date display that gracefully resets each month. The seven-day power reserve indicator shows how much juice is left in the IWC 51900 calibre. In honor of the 75th anniversary of the Portugieser (Portuguese) watch collection, IWC has added a touch of luxury to this already enigmatic piece. The curved front glass gives it a classic and harmonious look, while the horns have been designed for a more comfortable fit on thinner wrists. Plus, the alligator leather strap by Santoni adds a touch of elegance. Turning the watch over reveals a see-through sapphire-glass back,