Evans Disk Harrow worth

I also have an Evans disc harrow (sometimes called a disc plow, I just call it a disc)my neighbor bought at an auction. I checked the discs and bearings. The discs were sharp, and the bearings are in good shape and still full of grease. I told him it was too good to use as a yard ornament, and I'd like to have it. He said "I paid $300.00 for it at the auction. re-imburse me and it's yours." I didn't argue. So it's probably worth in that neighborhood. What my problem is, mine needs the wheels that came with it. The wheels are for transporting it over the road. If I can't find originals, I will have to do some modifications to get some universal hubs and bearings to fit. Also, I'm curious to how old it is. The S/N appears to be: LW5322950, and it says "Pat. Appl.". This makes me think it's one of the first made. I use mine all the time to till in horse manure that I've spread.

I know this reply is a little late (18 months), but I'm new to this website.