They are actually rather a fun old tractor. You can idle along quietly in a parade with it. It looks well cared for and well kept.
I have a hand start '44 with an 801 hitch on it I use to push snow and a very late long hood. I deliberately disabled the reverse interlock on the hand start which is my snow pusher. In HI R it goes about 7 MPH! Snow slides nicely off the end of the blade that way though one COULD get into trouble real quick!
Looks like the serial number is 553355 which is kind of a neat serial number. I believe that makes it a late 1945. I'm sure some others might know better but seems to me that's about the end of the war time steel tags.
You asked of getting the clamps off. Usually the bigger trouble is getting the hub to slide after the clamp is loose! Loosen all three but pull only the two beside the threaded holes. Chase the threads in the holes with a tap & clean the bolt threads with a die. Grease his nose & put 'em in the jack holes. Leaving that 3rd bolt in place but loose keeps the clamp from rotating on you with that last turn of the wrench where it breaks loose. Clean the axles & juice 'em up. I use kerosine & ATF to soak into the splines. Even if free and clean they tend to bind because the center of their weight is off center in the hub. The way the cast centers are on this one, they won't slide smoothly unless you push out harder on the top than on the bottom. To move in, push harder on the bottom than on the top. Kind of have to develop a feel for them. Usually if they're loose enough to wiggle, juice, patience, juice, wobbling to crush & break the rust with more juice to rinse it out works 'em loose.
I'd have a real hard time passing it up if I saw it though the last thing I need is another tracor! Looks rather well kept. Everything looks to be there and in pretty good shape for a machine approaching age 70. Even the sign holder (the fuel line) looks as it should.