I get the impression that the Seller's idea of value and most Buyer's valuation are too wide apart or that ugly green monstrosity would have found a new home long before now.
Just an opinion.
No harm in contacting him and making an offer.
However, I believe that I saw a set of photos of this tractor's loader that made me shudder over the way it had been constructed. If you consider buying it, go and see it first before parting with so much as a dime.