Damn. I wrote a great reply, and it didn't post!
Anyway, the 215S is the first cabinet with that name. prior to that, cabs were called according to which head they came with. There were, IIRC, three basic models: The big "folded horn" that came with the 1000S and 2000S, the smaller one that came with the 200S, and a smaller one that came with the Spectrum II and Sentura II.
Which one did you have in mind?