Hi Roy, I am glad you joined Welcome! You won't be disappointed, if you ask tons of questions or one or two. Somebody always comes forth. RE tiger head chips: both Robert Eisenstadt and Michael Par have a good handle on the subtle differences and of course Dale Seymour himself. Email me if you need their emails. It is a confusing subject indeed. I have some of both PATZ and PAUC but will not try to explain them cause I get confused also unless I am looking at them under good light with a mangifying glass, (old eyes). What the heck, they are beautiful none the less.