Wow, I've never heard/seen a 215 Beta combo.
Page six of the 1979 catalog describes the "Beta Series Self-Contained Amps." There was a 115, a 212 and a 410. Each could be ordered with a complete amplfiier or just a power amp.
The 115 was rated at 100W, 4 ohm, two channels, and could operate with a foot switch ("Beta Switch II"). But get this: It weighed 79 pounds! (Yikes! I hate to think what a a 215 combo might weigh.) Dimensions 31 x 24.75 x 13.
The same page describes the Beta series amps and the available cabinets: 115, 115 with a horn, 212, 215 and 412.
On a few occasions in Craigslist, I have noticed people describe their head-and-cabinet bass rig as a "combo" ...