American Greetings Birthday Party Invitations Vintage Style Bear with Balloons

I think this is a recreation of a vintage birthday invitation by American Greetings. There is no date, but there is a ID number - 35D Z-737-4 So, possibly vintage 50s but more likely vintage 80s reproduction? 12 invitations, only 10 envelopes Excellent condition, each invite measures just shy of 3" x 4" Printed inside with "I'm counting on YOU to join in the fun and help make my party a happier one" With lines for Date, Time, Place, and Name