i saw that add yesterday also. the owner said he got it and was going to restore but doesn't have the time. looks complete but i am unsure if it runs right now. he did say it drove off the trailer under it's own power.
If it's gas that would be an R5
5Exxxx 1934-36
4Hxxxx 1936-40
3Rxxxx 1940
A D5 (diesel) would be 1939.
Looks like the tractor number is 5G104SP in the photo
5Gxxxx is a Gas Forty, 1934-36 with 584 units built.