Update! I'd emailed Cambo to see if they could identify it. Nothing like going to the source. This was the response and it looks like it is a Legend....kind of
From Cambo:
"It is a Cambo legend, but a very early one and it has been played with a bit.
The front standard is mounted 180 degrees wrong on the monorail, the frame should be on the inside and the focus knobs on the right-side (from behind the camera).
That it is a unit from probably the 0-series can be seen as the monorail cap is aluminium, instead of the regular synthetic end stop.
If the scales do not mention “Legend” might also point at a sample from the 0-series.
The fact that the DOF calculator has both 4x5 and 8x10 scales is correct, as the legend was also delivered (once) as 8x10 camera."