Yesterday I spent several hours of my day cleaning those very tarnished and dirty spoons, all coming from the Sheraton hotel. They show 2 logos, the very early one and the current one. The oldest spoons are probably form the 40's and were found in a little antique store in Indiana (thanks Bev!).
Funny story, the Sheraton chain was founded in the late 30's when two Americans started buying hotels on the East Coast... one of those hotels had a very big sign with the name Sheraton on it, which was too pricey to remove. They left it there and named all their hotels Sheraton!