You know how you read those stories of guys finding gear under the bed, or tucked away
in the corner of the basement?  I kind of have one of those stories.  I had a flashback of an
Acoustic head on a shelf in the boiler room, and sure enough, there it was, an Acoustic 150
guitar head. Does anyone know about dating one of these?  And no,  I don't mean to wine
and dine it.  I have had it for so long that I don't remember where  it came from.  I believe
I aquired it in the late '70s.
I would be interested in finding out what year it is if anyone knows.  The s/n is  Q 75xx. 
It says made in Los Angeles CA.
Thanks...

The potentiometers may have date codes on them. 

Bill, tgo