Found a local seller that had one of these new old stock signs for sale.
It was used as a dealer sign in the 70's and measure 16.5” wide and 5.5” tall
Its in mint shape ! check it out

That is cool! 

Nice find Robb! 

Now THAT is a Awesome find !!! Lucky man.   A definite blast back to my past the college days.  I still have my PIONEER SX-1010 the FIRST receiver to make 100 Watts per channel its a beast of beauty.  Bought it in 1976 (came out in 1974 got mine at close out price) at HiFi Buys in Muncie Indiana for $430.  I still love the classic appearance.  Your sign is the right era   ENJOY.

Link to info on MONSTER RECEIVERS

http://www.arichinnerlife.com/...0/monster-receivers/

Thanks.. ^^ That amp is killer !! 

A hell of a find Robb. That looks like it was stored away with care for sure!

It is new inside the plastic bag when I bought it.