My guess is that this is a Slatington team because it looks like the site of the old baseball field, the "S" on the uniforms, and the other photos in the group were all from Slatington.
Lehigh Valley Champions. There are names written on the back of the postcard.
Top row, left to right: John Roberts, C. F Schoffstall, Robert Prestwood, Chickie Fritzinger, Carl Fritzinger, N. E. Smith, Prof. J. W. Snyder;
Middle Row, left to…
This could be the American Legion Post 16 in Slatington basketball team. That is my guess since this postcard was in a lot with other Slatington photos. The American Legion was organized in Slatington in 1919.