My collection is all over the map: pre-war, post-war, majors, minors, photos, postcards, autographs, artwork etc etc. Hard to pick a definitive "top ten". On any given day each of the following items would qualify as favorites.
Prince Oana


Baltimore at Montreal, 1905
Japanese high school baseball, Koshien Stad, 1936. Love the composition of this rundown.
Recent pickup at Chicago National
Smokey Joe Kreindler