I'll check the heel. This was dug in Chicago area.Based on my limited knowledge and reading some articles, esp the SHA.org here’s a couple thoughts. The large B is almost def what they call a sorting code. It allowed the dairy’s to sort out quickly returned bottles into the right location during cleaning. The B= Borden. On the E, and the digits, if— this is a Thatcher mfg bottle, the E is the plant code, Elmira NY. I have dug many thatcher made bottle in NJ, with the E. Most are from the 20’s that I have found. And if it’s a Thatcher bottle(look around heel for an mTc mark), then the 16/17 or 12/13 is likely the date code, ie 1916/17.
ROBBIE- you have experience with these eagle Borden’s, am I on the right track??