TC Factory Intercontinental 13th Anniversary Celebration - IWC Portugieser Series Tourbillon Watch!! IWCPORTUGIESER HAND WOUND TOURBILLON - Constant Power Manual Winding Tourbillon Watch. This genuine tourbillon seamlessly integrates the enduring modern design of the Portugieser series with a flying minute tourbillon at the 6 o'clock position. Gold-plated Arabic numerals complement gold leaf-shaped hands, harmonizing beautifully with the silver-plated dial.1. Exclusively developed Caliber 81905, with a power reserve of up to 72 hours, replicating the three major functions of the authentic piece.2. Case - Designed according to the original with a one-to-one depiction, replicating the authentic three-piece set. Every detail, from the front and back case profile to the arc-shaped brushed finish, is perfectly synchronized with the original, with a diameter of 42mm and a thickness of 11mm.3. Crystal - Sapphire convex crystal.4. Hands - The factory spares no expense, with multiple design, molding, and inspection phases to achieve hands that are three-dimensional and consistent with the original.5. Strap - Made from Italian cowhide with a crocodile pattern, hand-stitched for meticulous attention to detail, paired with an IWC original folding clasp, featuring clear lettering on the buckle that faithfully reproduces the authentic piece.