The F.P. Journe F.P.JourneBlack Label Chronometre Optimum Black Dial Platinum Leather Strap 42mm (Ref. CO-1510-PL-42mm) is a Platinum-cased luxury mechanical wristwatch. The case measures 42 mm. The dial is Black. Powered by a Manual winding movement. It wears on a Leather strap/bracelet. On the secondary market across 1 active listing. When buying pre-owned, check condition grade, box and papers (typically a 10–20% premium), service history, and originality of dial and hands. Use the listings and price history on this page to benchmark fair market value.