Circa 1919 Three Unidentified Philadelphia Athletics Players Encapsulated SGC Real Photo Postcard Graded 20 Fair.
Photo portion measures approximately 3 3/8" x 5 3/8".

I have researched the Philadelphia Athletics teams of that era and I believe it is 1919 or in that time frame and possible players Jake Munch, Willie Adams, and Lena Styles.

That is my best guess but the players may be different.  Back of postcard has "Philadelphia Athletics" written at top.