Posted By:
Brad Green
The thought about this set being produced by the Philadelphia Athletics Historical Society had crossed my mind at one point as well. However, I then considered the fact that this set includes Phillies cards as well and eliminated that Society from the list of possible producers.
So far, no concrete evidence has been presented as to who the producer of this set is. Several people that I've had email exchanges with seem to think that this set was an unlicensed set, possibly produced by Broder (as Bob mentioned above).