I haven’t seen this skeleton cat packaging for some time, so the seller is correct. (I enjoyed reading the thorough description accompanying the listing.) Beistle was manufacturing great quantities of their designs by 1970, so this jointed diecut would still have an RSIN of 4. However, a still-sealed package is no more than a 3 on the same scale. Beistle issued two designs of the skeleton cats or skelecats. The predominantly green and white design is also quite good.
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Mark B. Ledenbach's vintage Halloween collectibles blog.