This set of place cards was produced by Whitney during the 1930s. The full set of six is shown on page 273. This seller shows the rare glassine envelope. The information from the envelope indicates that Whitney sold two sets of these place cards in one envelope. They probably sold these as one set in one envelope early one, then switched to greater quantities per envelope as the design aged. I’m speculating but that would be consistent with practices by other producers.
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Mark B. Ledenbach's vintage Halloween collectibles blog.