These are great to use but also highly collectible for its stamp, its age, and where it was made. Zilco's have been made since the 1930s and production lasted until 1971. It is a B20 alloy cymbal. These were made as a budget brand usually on the thin side gram wise to be included in stores as well as drum maker catalogs to compete with their flagship brand called Zildjian. Zilco brand was made in both the Canadian foundry (Now Sabian) as well as the American foundry (Zildjian-Big fight the families split...it's complicated) The stamps are slightly different in the American made versions of Zilco Cymbals. There is really nothing budget about them. Zilco, both US and Canadian are highly collectible and a great cymbal to own and use. They were B20 alloy and as a "BUDGET Cast CYMBAL" before B8 sheets were made into what is called a cymbal made of "BRONZE" when to call anything bronze in metallurgical terms it need to be 9 percent tin, not 8!
Rogers Drums of Ohio and later California had the Canadian Zildjian family at the time make cymbals for them to be sold in their Rogers Drum catalog and included in their complete drum set packages that also included hardware, throne, sticks, brushes, and a drum key.
The Rogers SS Cymbals are super rare, much more than Zilco's because of the limited time they were in production.