I recently purchased an enveloped set of Beistle silhouettes with this same image on the obverse, but with 15 sheets containing 30 silhouettes as the complete contents. With no diamond mark, I know the enveloped set is somewhat later than this version. Whereas the eBay listing version has a stock number of 573, the enveloped set has a stock number of 574.
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Mark B. Ledenbach's vintage Halloween collectibles blog.
