[benge610]

Originally Posted by brianp-beme

I would assume this was a company event at the ballgame that day (July 17, 1964), and perhaps these cards were handed out to employees/family members that were going to that game from the Martin Company, a big aircraft manufacturing company that had a big plant nearby (the Orioles played a home game that day, Robin Roberts was the starting pitcher, and Aparicio and Robinson were in the lineup). I guess the Zero Defect motto and Error-Free standard were upheld that game, as Roberts pitched a complete game shutout, and the Orioles played a flawless game with no errors committed.

Brian (having a bit of fun with research)

Nicely done, Brian.
Ben

"I love baseball history backstory; especially when it involves cards."