Another shot. If your experience leads to anything other than what I've found/described I'm open to learning. With changes of logos, ownership of company and commingling of brands it can be daunting to figure out a date.
The call that a LBL (Large block logo) EPU (having Erie PA USA on it). 1920-1940 respectfully. One of my users is a 6 LBL. Nice iron. If you have any other CI questions throw em my way. If I dont know the answer I usually know where to find it