1957-1959 Citroen "Transoceanic" jointly developed by Citroen and Herwaythorn Co.
Apparently derived from the Citroen 55 as a prototype for the Citroen 46 FOM. FOM equals roughly, Overseas Forces, a military 4x4 of 3 tons.
My research on French Desert Vehicles some years ago reminded me of the 46 FOM and I re-discovered the prototype.
Bill