A fine vintage example as pictured. Gorgeous walnut cabinet has scratches and wear consistent with age and use.  Measures about 13 3/8" square.   I tested it. It works and makes a deep bass sound.  I don't have the gear to test it properly,wired as a sub, within a 5 channel system.  As such, selling it all as is for parts or repair.  I didn't open it up.