If you could post a nice photo of it, it would help. Its condition (both looks and mechanical/electrical) makes a big difference. I'm guessing that model may have a 3-cyl. Mitsu engine, 17-hp PTO rating, is 4x4, and I assume it's a gear transmission (hydro would be worth more). If it's a Bolens G174 then it is a 2-cyl. (Isuzu?) and is gear drive with 4x4, and has a 17-hp motor rating. The year of the G174 is from 1979 to early '80's, as shown in my 1979 Bolens brochure.
A tractor with re-sprayed sheet-metal and no original decals can really take a dive in price, at least with me. If it looks nice and is pretty much original, the gear drive tractor could be worth $2500 to $3000 with the mower. Someone might pay more, especially if they consider what they get new at the local store for that price. If it doesn't look nice and has lots of rust and torn seat cover it would be worth MUCH less. The blade and scoop together may be another $150 if in decent condition. Bolens branded Isekis should return a better sale price than their grey market equivalent, like my TS1610F is.
Bill