It's a Paiste 2002 20" ride from 1976. I been using a Zildjian ZBT 20" ride as my main for a couple of years, so this quite an upgrade :-)

It is a bit nasty, but other than removing the crusty tape residue on the bottom side, I don't think I'll be cleaning it, it sounds great as it is.
btw. lamp-oil is great for dissolving old tape residue