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fkwIf you look in the 2006 SCD Catalog. There are 2 sets of W502 cards, 1928 and 1931. But there is only one set of the related "W-Unc. Strip Cards", 1931. There should be 2 sets listed inder "W-Unc. Strip Cards", the 1931, and 1928 (like yours). The cards you have are basicly blank backed 1928 W502 cards.
"1928 W-UNC. Strip Cards" same checklist as the 1928 W502 (and related ice cream sets)