Since the launch of A. Lange & Söhne's Lange 1 in 1994, the model has seen variations to the dial, bezel and bracelet. The present watch, Lange 1 Soirée, incorporates all the iconic elements of the Lange 1 model such as the patented outsized date, power reserve indication and the exclusive caliber 901.4. The Lange 1 Soirée features an additional mother-of-pearl guilloché dial, designed like sun rays, which seem to emanate from the dial center.