I owned that Oliver for years and it never let me down. There are several farms near me that still use Olivers in the field on a daily basis, granted they are using larger Olivers than the Super 55 now a days, but they are still out there. I paid $2450 for mine. I put some new sheet metal on it, painted it pretty and gave it decals. But mechanically that tractor was untouched while I owned it. It just worked, and it worked every day I had to fire it up.
The Ford 8n set the design pattern for utility tractors, but they were far less capable with less torque and fewer gears and I think that the prices people pay for Olivers today prove that they still are better tractors even after 50 years in the field. From what I can tell around my area, and from what I saw on Ebay, Ford values are based very largely on the IMPLEMENTS that go along with the sale. If you put a newer finish mower on a painted up Ford you can get $2200 to $2500 for it, but 1/2 of the value is in the mower deck!!! The Ford, left to sell alone, will sell for $1200 to maybe $2000. Other parts of the country might be different?