Still learning on these....
On the Salutation design......
Williams "no9" (1960), Feller "pitching" (1952), DiMaggio (1952), Holmes (1949), Marion (1949), and a few others were printed after 1946, some well into the 50's like what was mentioned, Williams is seen on the uncut 1960 sheet so was at least printed that year if not a couple times earlier in 1950's as well
exhibits are interesting trying to figure all this out. the Post Gazette cards are interesting, these 4 you got Leon were the first time I noticed they had the 2 types. Not an expert at all on them.
quick examples...
DiMaggio was printed in 1952 for sure, dont know about any other years. All the 1952s are B&W thats how to date them, the others can be dated by the size of the MADE IN USA, Made in USA, PRINTED IN USA, Printed in USA, or by "An Exhibit Card" in corner (1949)
example of the 1952 DiMaggio (B&W)
example of a ca.1946 one, sepia color
