Č.S.P.S. stands for "Česko-Slovenský Podporující Spolek" (Czech-Slovak Protective Society). It was a large fraternal organization supporting the welfare of Czech and Slovak immigrants to the United States. It offered a type of insurance for the Czech people.
The Ely C.S.P.S. was located on the north side of Walker Street between Dows and Traer Streets.
Read an earlier post about the Ely C.S.P.S.
A close-up of the line-drawing (Click the image to enlarge it.)
A view of the C.S.P.S. Hall from an old postcard.