When Cvstos and Karen Khachanov unveiled the first Challenge K. Khachanov last year, it landed as a focused proposition—a 55-piece limited edition in super-light aluminium, weighing only 55 grams, with blue PVD-coated bridges and a three split-bridge architecture that gave the CVS610 calibre real visual presence. At USD 19,800 it offered a lot of watch for the money, and the market agreed: it sold out.