I checked it out last post; 1912 was his rookie year.
I have since continued to read the excellent bio by Wikipedia on Casey and recommend it to anyone interested:
https://en.wikipedia.org/wiki/Casey_Stengel
I may still have the book, Casey at the Bat, which I read as a boy, but I can't imagine that it captures Casey and his career better than this journalistic piece of a few thousand words.
Myself, I well remember Casey as manager of the Mets, but that's another story.
Hopefully, someone will post a card or two [the 1936 Pastel is memorable!], but the scan below from one of my Brooklyn books will have to do for now.
I'm also going to include more scans of earlier cards of players that I missed [like the last of the legal spitballers, the great Burleigh Grimes] before I hasten to conclude.
So, pardon the barrage of random scans.
I do note though, that my Brooklyn collection has the greatest variety of different type baseball cards that I have, and I hope that the mix of many beautiful cards is worth viewing.