That looks about correct.A bass amp with an A/B channel and no distortion or reverb sounds like a model 320, which was often paired with the wide version of the model 406 2x15 cabinet.
I bought it used. Not sure which year it was mfg.
In retrospect, I think it was a model 450 guitar / bass head w/ 6 x 12" cabinet. (Purchased in 1974-5)There weren't any Acoustic amps with a 3-button footswitch with A/B channels. You could get A/B and distortion on a 470, but that had a 4-button footswitch (A/B, distorion, reverb, tremelo). I suspect what you're talking about is a 230, with footswitch buttons for reverb, EQ, and master volume. The master volume could generate some sweet sounding distortion.
And it had a two button footswitch, not three.
Memory playing tricks on me.... sigh.