Here are a couple of my earlier Philadelphia Eagles letterheads.
The first is the first page of a 3 page letter from Bert Bell to his wife. I believe this undated letter dates to about 1935 or 1936, because it was at that time period Bell had a falling out with his friend and GM/coach Lud Wray, and Bell crossed out Wray's name on the letterhead.
The second is a 1944 letterhead.
