Originally Posted by CharleyBrown

Dan,

It might be worth exploring some old newspapers / publications from 1947 to determine whether it was the fall or spring of '47.

I do know that many of the '47 BB set of 44 pictures came from team photo packs from 1947, so it might be worth exploring when those were made available by the teams. I would believe that the cards were distributed after the team photo packs were, since the photo pack images appear to be the source of the BB photos.