Very cool vintage Grumman sign. It measures 71 x 18 inches. This version of the Grumman logo was used from 1929 - 1976, so the sign is definitely older. In 1976 the logo changed to a more simplistic style. It has paint transfer, aging, and it’s a painted metal sign.  It is neat that it is for Grumman Boats and Grumman Canoes.
 
There are some dents and dings and imperfections, but sometimes that gives a sign its character, and that is definitely the case for this one. Finding a marine sign is rare and great for a boat collection.