found this piece recently and had to have it. Never seen it before. Lots of wear on the seams. Basically, the mailer is a three-part that folds three times.
The address part with the Pollard (HOF) picture and the Cullom's Column is the outside.
Unfold it to regular paper size and there is a great Mikan image:
Unfold twice more and there is a three-sheet (four side) article on Mikan:
Dates to the pre-season of the 1948-49 NBL season, the first for the Lakers in what would become the NBA, 2nd year for Mikan.