Here's another ad from the Mister S Drive-in Restaurant. (Click on it to see a larger version.) Despite the fishy focus of this ad, the restaurant's real specialty was Treasure Chest Chicken. I'll bet the chicken came in a really cool pirate-type box!
Despite much Googling and library research, I can't seem to find out very much about this restaurant. It apparently was a national chain, because in one of their logos you can just barely make out the words "coast to coast" under it (at right). At least we know that the 'S' scans for 'smiling speedy service.'
According to the Lorain City Directory, Mister S became Gyro House around 1985. Then, around 2000 it became Gyros and More. Although I never ate at Mister S, I've gotten carryout from Gyros and More many times through the years and always enjoyed my meal.
But I still want to know who the mysterious Mister S is!