FAR Mechanical Horse 6 ton
The French company FAR produced a licensed version of the Scammell Mechanical Horse from about 1938. After the war the developed a new version, the equivalent of the Scarab produced by Scammell. This was original FAR version of the 6 ton tractor unit.
FAR continued to develop their version of the mechanical horse, including 3ton and a light weight 1 ton tractor. Production of FAR tractor units continued into the 1970s, a few years after Scammell stopped their own versions.
Scale OO (1/76,4mm/ft)
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more info about Scammell /FAR Mechanical Horse
https://en.wikipedia.org/wiki/Scammell_Mechanical_Horse
more 3d printed models from Recreation21 here
http://www.rue-d-etropal.com/3D-printing/3d_printed_designs.htm