I have a number of what I call "letter caps." In each case, I can't figure out what team it is based on a letter or two — and maybe never will. Here's one that resembles yours, which was sold to me as an Erie Sailors cap from the early 50s. But I won't confirm it until I find a photo match.
I've never seen a Leslie label on MLB caps, but I have one on a Cape Cod League cap from the 1960s. The company definitely had a hand in making MLB caps, and the company name shows up on McAuliffe and KM Pro cap labels.
With a generic "E," it's going to be tough to ever know for sure what team it is.
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