Piaget Emperador “Ultra Thin” Dresswatch Black Dial ref. 9591 in 18k white goldPiaget is renowned for its mastery in crafting some of the thinnest mechanical watches in the world, and reference 9591 is a classic example of that ultra thin elegance. Piaget carved out a niche as a leader in ultra thin dress watches, competing with other haute horlogerie brands but often setting the benchmark with record breaking slim calibers. This fine dresser is executed in 18k white gold, with a 30 x 32 mm caseneither square nor fully rounded.