[Groo]

That is a tough call. The hydrostatic on it is going to he much stronger than a new hydrostatic lawn mower's, but you've got an old single cylinder engine, and attachments that utilize the capabilities of the machine might as well not exist. If the snowblower needs more than a shear pin, it is likely scrap metal.

I might ask $2k and accept significantly less, but of course what you can get is going to be based on your local market.
eta; I found this; https://up.craigslist.org/grd/d/manistique-case-446-tractor-with-extras/7165910953.html
so maybe the $2k asking price is way high.
In all fairness, what you have is only useful as a mower, and it won't cut as well as a modern $1200 big box mower, so maybe ask $1000 and take $500 would be more realistic.

 

[Groo]

That link is actually a pretty good deal on a 446 with all the parts, extra attachments, 2-stage Berco blower, and re-powered with a 23HP Vanguard. He says he even has the factory cab, which is hard as hell to find. With the doors, just an OEM cab usually goes for between $600-$800.

His biggest problem selling it is he is in Manistique, which is in the UP of Michigan. No easy way to get there and you'd pay big $$$ getting somebody to pick it up using U-Ship. I've got no need for something like that down here in MS. Here's a picture of my front yard after the "Blizzard" that shut down Tupelo for 3 days in 2018
View attachment 59781

Manistique isn't far from people that need a newer snow blower and a cab for their garden tractor.