Yours is the Crealock design, most likely. These predate the use of the large signature Ericson color stripe just below the rail that came later. The Ericson 30 that is in the "rotation lineup" for the splash screens of this site has only a thin cove strip, as it looks to me. It also has a moderate waterline stripe. I do not know if they sported a logo in those days. There is an early E-26 like yours in my YC, but his hull has been repainted several times and there is no sign of a logo. I would obtain the logos and put 'em on each side, just forward of the transom, just like the later Ericsons, if I were refinishing the hull. Keem 'em small, so as not to be out of proportion to the size of the boat.
Just my .02.
Loren