Serial# 2810000- onwards from 1969-71. 75mm Xenotar 3.5 or Planar 75/3.5 lens. Heidosmat 75mm F2.8 viewing lens. Synchro-Compur shutter MXV 1/500 to 1,B. Optional coupled meter, Has detachable hood, improved focus screen, eye level viewing. 12/24 Frame counter. Bay II. Does not accept plate glass back. Distance scale in meter and feet. 6 element lenses, self timer.