1971 Ampeg B-15 S Flip-Top Bass Guitar Amplifier Tube /ALTEC 421A- 65 WATTS-FROM WHAT I KNOW THE EARLY AMPEG B15S were not labeled with the speaker chosen at the factory. My Uncle bought this with the Altec langsing 421 A installed in the cabinet. I am the second owner but it has remained in my family.ALL STOCK WITH CABINET DOLLY See Photos. THE BASS AMP/THE 1# BASS GUITAR SOUND/COMES WITH CABINET COVER