IWC Classic "Calatrava" Ref. 6531There is a quiet authority in this piece that only mid century watchmaking can deliver. A restrained 35. 5mm steel case frames an elegant ivory dial, where time is expressed with clarity and confidence rather than excess. The conium indexes catch the light with subtle geometry, offering depth without distractionan aesthetic language that belongs to an era when proportion and legibility were paramount. At its core beats the legendary calibre 853, one