The date on this nicely designed Dennison invitation is interesting. This item first appeared in a Dennison 1928 Price List pamphlet. This rather battered survivor has an inked date of 1938 which means that either Dennison sold these for ~10 seasons or (more likely) that the original party giver was a pack rat who held on to the pack of invitations until another party opportunity arose. I give more credence to the latter possibility because this design is seen seldom enough that it warrants an RSIN of 2.
Mark B. Ledenbach's vintage Halloween collectibles blog.