For this 100-piece limited edition, the 1815 Tourbillon with Enamel Dial, the 39.5mm case is rendered in platinum and comes in at a wearable but noticeable 11.3mm thick (the entire structure of the enamel dial accounts for 0.2mm of that). The dial is the only real change here, but the enamel makes a strong statement that easily sets this version apart from the previous iterations of the 1815 Tourbillon. It's crisp, silky smooth, and an excellent base for both the black polished tourbillon bridge and the long blued steel hands.