Wow! You learn something every day! (or should, anyway...) I knew that the old 3-speed internal hub bicycles used a 26" wheel, but I did not know that the racers were available in that size, too.
I don't know what an EA1 is, and I am unfamiliar with the word "singletube".
I can imagine that these 26" racers would be just-the-thing for path racers.
Dunlop invented the clincher rim?
Very nice example, there, in the photo. (Quite long stays, I see).