Right now it seems dirty to me. Plus still has paper stuck to it's back so you can't really see any other problems it might have.
I think it would be good to soak that paper off and also soak the stamp to clean the dirt off. Then you can see what colour it might be a lot better.
I like the cancellation and would buy it cheap to have that alone.
Clean it up and to find it's worth, try starting it at 99c on
ebay, call it the proper number of 17 or whatever it turns out to be.