This A. Lange and Sohne Grand Lange 1 reference 117.040 is a limited edition of 25 pieces made for Dubail, the Paris retailer whose long partnership with the brand is so close that Lange made it one of its rare retailer editions. In this form the model takes one of Lange's most fixed modern designs and shifts it into a markedly different register, which is why collectors tend to separate it from standard production examples.Its manual-wind calibre L095.1 carries the outsize date and power reserve display that define the Grand Lange 1 without adding anything extraneous to the layout. Cased in 18k white gold, it measures 41mm across and 8.8mm thick, a broad diameter kept notably slim in profile. That proportion is a large part of the watch's appeal in hand, giving the piece scale without the heaviness that often comes with it. The mother of pearl dial is the detail that changes the watch most decisively, softening the architecture of the display without blurring it. Made in such a small run, it shows Lange at its most controlled when working outside the core line.