The modules, built by Christopher Ward and SH to sit on existing movements from ETA or Sellita, were designed to make high-end complications more accessible. First came the JJ01, Jahnke's hyper-accurate jump
link hour module where the power is drawn back over an hour
link and released without impacting timekeeping. The JJ02 was a monopusher chronograph
link module, the JJ03 a world timer, and JJ04, a moonphase accurate to 128 years (a feat few brands can boast).