Scotch SX 90 Studio Master - 1994 - US
Very little is known about this cassette from my research. I'm guessing 1994, as the cases and appearance look like the Quantegy AVX from 1996, but these must be earlier.
Not seen very often in the EU.
Made by SKC (3 hole hubs) but not a pure chrome, these are filled with their QX Type 2 from what I can tell, but with a very sombre and "professional" look to them.
These are really good Type 2
*NOTE* Even though these are brand new and from master cases, they are not individually sealed