The 135 was available with flat top fenders as an option. But that's not what stands out to me.
The seat is NOT all original as the ad suggests. 135's were available with a pan seat, or float ride seat as a very common option, but the cushion is NOT original. also, decals aren't original. They are AGCO/MF replacement decals such as is available over their parts counter these days. Also, gauges are all replacements, including tach, giving me cause to doubt the hours shown as accurate, and in turn doubt the entire story.
MF 100 series tractors use a lot of cork gaskets, which seep oil, and did so almost from day one. Claiming no oil leaks on a 40+ year old Massey is a giant red flag. Any oil that did leak stains the flint gray metallic paint. The tractor has been re-painted. Bet my life on that.