Comparing the R79 Leader Discs with M30 and R123 Seal Craft Issues
Jefferson Burdick classified the 1930s Seal Craft Discs as M30 and R123. The reason for the separate classifications was because some were distributed in newspapers and others were associated with a gum issue (Dietz Gum). In all, there are three known M30 and R123 sets, as discussed here in our database. However, some collectors feel a fourth set belongs –
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Pre-War Cards 