Calvin,

No it is not a transport type. It rides on the discs. You pull a trip lever as you drive forward to angle the disc and then back up to straighten them out. The age of the disc would be somewhere in the late 1940's (?) early 1950's. I was born in 1950 and I can rmember having those disc harrows around from my earliest memories. I am surprised at the fine condition they are in, considering that they worked a lot of acres and that they have just been sitting around not being used for over 40 years. Pop bought the 252 12 footer around 1967-68 and these haven't been used since. I still have the 252 also. Got a 575 hydraulic reset 5X16 plow, too. Hope that when the estate gets settled I can hang onto them.