Fun guns to shoot, big enough for an adult, or a larger size kid, but not worth a heckuva lot.
I fixed one up for an acquaintance on Vancouver Island, that he used henceforth for whacking bunnies in his garden, and likely, still does.
They can be a bit fiddly to put together, keeping everything aligned as you close up the clam shell halves of the 'receiver' can be a bit of a trial sometimes.
If so inclined, these can be tuned up to give pretty respectable velocities. Dunno for sure if they started putting the bleed-off valve onto the valve body right from the start, but some I have seem had one, that was supposed to release 'excess' air when you pumped it too many times. That valve can be adjusted or to get a more consistent 490 or so fps, or taken out and blocked off. I have also considered that it could become a reservoir of sorts, for a little bit more air volume in the chamber of the valve too. YMMV.
Fun guns. I'd say that about $60 should be a pretty easy sale. Maybe a little more. Check the 'for sale' section on the Canadian Airgun Forum for a better idea of current ask and sell prices.
Cheers
Trev
