Hallmark Betsy Clark Invitations PM 3-7 1981 Set of 8 w/ Envelopes VTG Unused

Set of 8 vintage Hallmark invitations, dated 1981, featuring beloved artist Betsy Clark. The back was marked PM 3-7, Hallmark's internal series code for this Party Mini invitation design. The front shows a sweet scene of a little girl and kitten marking a calendar with the text "Please Keep This Date Open". Each 4.75" x 4" card is unused and includes its original yellow envelope. Inside fields: FOR, DATE, TIME, PLACE (all unmarked). Very good vintage condition -- clean and ready for collectors or themed events.