The ref. 116.021 Lange 1 Zeitzone has a yellow gold case and a silver(ish) dial. It was first introduced in 2005.
Handwound movement with Shock-resistant screw balance, Nivarox® balance spring* with a frequency of 21,600 semi-oscillations per hour; whiplash precision index adjuster with patented beat-adjustment mechanism. Home time coupled with outsize date; zone time with city ring; separate day/night indicators for home and zone time; subsidiary-seconds dial; UP/DOWN power-reserve indicator; stop-seconds mechanism.