I wasn't aware of the whole story Cardinal collector posted but I will add these. (below)
Although I can no longer find the story (still searching) I read an article that read, due to Sain being the last pitcher Ruth faced and the first pitcher Jackie faced, this is why the Sain, Page bio error is more sought after than the Page, Sain error card.
PSA's article is wrong. It states Ruth faced Sain in 1935, which is not true. 1943 makes a lot more sense.
John Franklin “Johnny” Sain (September 25, 1917 - November 7, 2006) has the unique distinction of being the final pitcher that Babe Ruth faced in his career in 1935 and the first hurler that Jackie Robinson would face in the big leagues after breaking the color barrier in 1947.
https://www.psacard.com/cardfacts/ba...t-bio-49/22973
Sain also had the distinction of being the last pitcher to face Babe Ruth[3] in a game and the first in the Major League to throw a pitch against Jackie Robinson.[4]
https://en.wikipedia.org/wiki/Johnny_Sain