Farm Equipment Query

I have a couple of tractor accessories I'd like to know about--and possible sell if they are worth anything, since I don't have the tractor for them anymore, or any need for one.

First is the plow, which I think might be a Little Genius Single Bottom. It's been in the woods for at least 30 years, but still looks pretty good. One wheel (left side is metal, the other is a wheel and tire. I don't know exactly what it is, except that it has a International Harvester logo on one side of the part  with the number on it below

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 The full number on this part is P1618  \/

 
Parts move stiffly, but most look like with a little elbow grease and TLC they would work.

 Second is a disc harrow of unknown identity.  It's a little more worn, with some of the discs missing chunks of the metal to rust.

Last is something to do with hay mowing.  All have been in the woods for the same length of time. My dad used the harrow back in the 80's with an old Case tractor he restored to running, but when he passed in '96, the tractor was sold and the rest left out in the woods. My mom didn't want to deal with them, but now she'd like to sell them.