Cool old solid state amp from the early seventies.  National/Valco went bankrupt in 1969 and the name was bought by Strum N' Drum.  A name I'm sure we all remember well.  This was a low budget student amp probably manufactured around this time and imported.  Has one powerhouse 6" 4ohm speaker.  The power transformer and circuit board in this amp make small Behringer amps look like gigantic monsters.  Missing back plate.  A interesting part of Rock and Roll history.