Thank you - I'll at least be able to tell if something is a 20

There are plenty in the World Research area at ngccoin.com (they pull from Krause listings) and a few look like this one - I don't think it's the 498 above as the center rosette on the reverse in that picture doesn't appear on this one. So now it's just a matter of narrowing down the year and province. Thanks a lot, everyone!