Grubb's Marine in Spring City, PA, was a dealer for Duratech in the 1950's to very early 1960's.  This sign would have been purchased new by them in the late 50's.  It has been a part of my personal stuff ever since.  It measures about 25" wide X 10" high X 3 1/4" thick.  The first picture shows it plugged in and lit.  I have never seen another of these. I am downsizing and decided it is time for the next owner.  Thanks for looking and bidding.  Bob Grubb