The A. Lange & Söhne Lange 1 reference 191.028 was introduced in September of 2017. It features a white gold case and a solid silver dial in blue. While not a limited edition, production is said to be limited to one year only.
Apart from familiar hallmarks such as the twin mainspring barrel with a power reserve of 72 houres, the 2015 calibre L121.1 has an escapement featuring a balance wheel with eccentric poising weights as well as a freely oscillating balance spring crafted in-house. Beneath the hand-engraved balance cock, the balance beats at a frequency of 21,600 semi-oscillations per hour and assures high rate accuracy.