Of course you can. I have one of these myself. Hangs on my office wall. Its the gift that keeps on giving. Every time I think about buying some turd pink sheet stock, I have a look at that and chuckle. You should get one, might save you some money. lol! --
You can buy anything, as to rights you certainly wouldnt be recorded as the beneficial owner of that certificate however if their isnt a TA to change that beneficial ownership.
It is quite pointless to buy revoked certificates however, unless you are looking for a decoration on your wall for some "wall street" inspired theme.
Not sure who would want to buy them or sell them. Plus they could be stolen or lost shares. The change of ownership needs to be documented and there are rules with that.