Here's my 606. It had very low hours when I bought it. (28). It was a great machine for harvesting our maize (corn) with it's independant PTO (live drive) beaut soft hydrostatic steering, independant hydraulics for trailing implements (2 banks)and T.A. (torque amplifier) it was ideal.
The smooth 6 cylinder that never made your hands tingle after a days work, neighbours with 706's were astounded at its capabilities. It was out performing 656's which replaced it.
(Farmall 504 in the shed.)