The early Zyns of which I speak look very different in colour as the later Zyns,about the same colour as my 20s/30s Ks and have that same soft warm feel in your hands.unlike the hard cold feel of the post P.O.W.s made cymbals.The Standards are stamped "standard quality" and sometimes as well "made in England",under the usual Zyn stamp.the Super has "Super" over the Zyn stamp,very similar to the later stamps,in a curve towards the left of Zyn. Dion
Those early regular Zyns that you speak of, were an alloy very close to B-8. Someone I know from England had one of these very early ones analyzed by taking some shaving from inside of the bell hole and sending them to a university chemical laboratory for metallurgical quantitative analysis. I think it turned out to be B-12 or something like that. But you're right, the earlier ones were different. Then later on they switched to Nickel-Silver alloy.