I can tell you for SURE it is NOT a Case 580B Construction King, because I have one - In fact, I'm pretty sure that isn't even a Case because the loader geometry is totally different; yours has hoses going places mine doesn't, the rear hitch appears to be integral with the tractor (580B has rear "sub-frames" that comprise a "4-point" mount which can accept either a backhoe or an INDUSTRIAL 3 point hitch that has its own 4 valve control (which sits just INSIDE the fender on the right side) and either float or power down, hydraulic top link and side link (but NOT Position control or Draft control) -
The box blade is an older Gannon, I have its twin brother except mine has hydraulic rippers. Good SOLID workhorse implement.
Here's a few pix of Case construction hoes/tractors of that era, note the loader arms - as far as I know, even today's Case hoes use this "backward" linkage - it reverses how the loader curl (AKA tilt) works, so those cylinders are PUSHING to curl. That puts the FULL FORCE of hydraulics into CURL, which gives you a LOT more "breakout" force for digging. I added a pic of the Case 3 point hitch option also.
There's more, but my breakfast's getting cold :licking: ...Steve