My great grand father was a tugboat captain for Esso. I ended up with the Esso flag from his tugboat. I've recently been trying to get information on the Esso tugboats and the flag and trying to determine its value. I imagine not many of these survived. I think it's from the 30's. It was made by Annin. Any help determining the value of it and information would be much appreciated. I'm still learning how to post a picture of it here. I will post one a soon as I figure it out.