Mistake on the schematic maybe. I never saw a 25¢ pin in 1963. Late in the 1960's a dime a game and three for a quarter, and having two coin slots. One for each coin.

LTG : )

That's odd. This how the add-a-ball games of this era were set up. Does the game award replays otherwise?

Mine has both a 5 cent & 25 cent entry, along with a sticker on the apron that says 5 for 25 cents.
I have changed some replay games I've purchased that had the single entry to what I believe is the correct dual entry the only problem is the coin entry shoots are really hard to come by.

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Sounds like an operator changed a dime play game into quarter play by swaping out the coin acceptor.