Two of the cards that clearly show this is a game between the Orioles and Indians involve Jack Brohamer. In fact, I think both of these cards are from the same play:
In the top of the 3rd, Brohamer singled, and then was out on a double play on a ball hit to 2nd. Jack's card shows him getting tagged out by 2nd baseman Bobby Grich. I think the Mark Belanger card shows a photo of Brohamer at the conclusion of the play coming into 2nd, and Belanger jumping out of the way.
On the Gerry Moses card which started me on my search, we can see an Oriole sliding in to home behind him. The Oriole appears to be Mark Belanger, who wore # 7. Gerry was traded along with Graig Nettles to the Yankees on November 27, 1972, which is why his cap has been airbrushed, and why his card lists him on the Yankees.
Belanger scored on a sac fly by Bobby Grich in the bottom of the 4th.
And finally, we have Jim Palmer's 1973 card which shows him pitching at Memorial Stadium. While there is nothing to confirm that this was taken against the Indians, Jim did pitch a complete game against the Indians on May 28, and got the win 5 - 1. Given all the other pictures that seem to be from this game, I would say the Palmer card is from that game as well.
I'm not sure what the record might be for number of game used photos from a single game being used in 1 set, but having possibly 10 cards from the 1973 set coming from one game is pretty impressive!