18k rose gold in 41.9mm, from 2013. The three-part regulator dial of the RICHARD LANGE TOURBILLON “Pour le Mérite” was inspired by a precision chronometer crafted by Dresden master watchmaker Johann Heinrich Seyffert. An inimitable feature of this timepiece is the aperture in the subsidiary-seconds dial through which the tourbillon can be observed. Hand-wound, one-minute tourbillon movement contains 636 parts. 36 hours power reserve. Priced at US$175,600.00