Vintage National Walking B3 Tractor Sprinkler

I have a very rare heavy duty National Walker B3 series Tractor Green with red covers on wheels. This is a working condition ,set your hose on path you would like to water and Tractor follows the hose as a guide for those whom done know what these do. I'm looking for $250.00 cash or trade these sell for much more than im asking Will trade for newer higher end golf club set Taylormade rbz, ping so on. I Will add cash or other vintage tools sprinkers i have all kinds of tools from newer to vintage. This Tractor is all original except the paint but it works unlike some that are listed. I also have other vintage sprinklers and another mint condition vintage Tractor red in color asking 75.00 for it never used only tested and works great have wheel stop if interested just ask. Will sell all sprinklers for $350.00 248 4nine6-3572