1970s baseball pinbacks

[sago]

They appear to have been shot in a studio, and probably at the same time for each team. You can ask one of the pictured players if they remember, should one of them appear at a show to sign autographs.

[thansen30]

The were definitely shot in a studio, using the same backdrops. They are also very well photographed--that's why I got in contact with Ozzie Sweet's biographer to see if he had anything to do with it. Dead end.
They also feature the imprint of an actual signature, reproduced primarily in brown ink (not a signature font like many modern pinbacks). The Tommy Harper pin has no signature on it.
Because of the teams involved, i'm guessing they were shot in NY, Chicago or LA, for access to teams from both leagues, and probably within the same time frame. I'm wondering if there are 10 players from each of the teams, as we no know there are for the Brewers. I have multiple players from Cubs, Brewers and Red Sox, but only single players from the A's and Giants, and have seen single players from Pirates and Senators . . .