Sure its a Fender Bassman...but hey they are all the rage now for guitarists!
Looks like it was modded for an effects loop. Remember those lettering imprint guns with the rolls of heavy tape for doing labels - from the 70's? I just had a flashback.
Nice tie dye too! Courtenay told me the tie dyes on those old amps were set on plywood and screwed on. You can see that in this image.