The IWC Portugieser Perpetual Calendar. 42mm x 13.8mm case in both stainless-steel or 5N gold, water-proof to three bar. Powered by the in-house automated caliber 82650, beating at 28,800 vph and operating in 46 jewels with 60 hours of energy reserve. Pellaton winding system with sturdy ceramic parts. Out there in three totally different variations: ref. IW344203: stainless-steel case, silver-plated dial, black alligator leather-based strap by Santoni, $22,900; ref. IW344202: 18-karat 5N gold case, silver-plated dial, brown alligator leather-based strap by Santoni, $32,900; ref. IW344205: 18-karat 5N gold case, blue dial, blue alligator leather-based strap by Santoni, $32,900 (observe that the boutique version can also be obtainable on the pictured woven strap).
