It's well worth
link pointing out that IWC is not abandoning the larger 52000 series of movements for the Portugieser Perpetual Calendar. In addition to the gold-cased, blue-dialed, cal. 82650-powered boutique edition you see above,
link there is also a second boutique edition that features the larger 7-day movement with blue dial and gold case, which uses the caliber 52610 and IWC's proprietary Armor Gold, a
link highly scratch-resistant formulation of 5N gold. It is a classic, after all.