I got hooked before I could barely talk. My grandfather sold horse(mule) drawn Oliver equipment beginning in the early 30s. My relatives sold Oliver equipment until 1967. My Dad and uncle used Oliver equipment on the farm. We had all the fleetline series plus a 550, HG68, OC3, OC4 crawlers. We used all Oliver equipment with few exceptions. The crawlers were my favorites. The Oliver dist. manager would use our farm to demonstrate new equipment to area farmers. I now own a 550 and several Oliver toys. I am in the process of looking for a HG or OC3 and a 44 or 440.