7/8” like related item #900 by Benj. Harris Co. of NYC. This button has the text “UOPWA-War-Relief-Fund” plus a list of countries and group “Britain/Russia/China/USO.” The initials stand for the group name United Office and Professional Workers of America. This was a left-leaning organization whose members made radical calls for economic and social equality, particularly following WWII. Rare and essentially Mint.