ROMOX ECPC Cartridge

Hi everybody,

In a recent donation we received a ROMOX ECPC cartridge with Astro Chase burned on to it.  Pretty neat!

Does anybody have an idea as to how many variants of these cartridges existed?  I've seen stickers that have "REUSABLE CARTRIDGE" instead of "ECPC CARTRIDGE".  Does anybody know which came first?

I've also seen different cartridge molds which came in black or white.

Any info would be great.  Thanks.