*Rare* Vintage 1950s 1960s Hallmark advent calendar Getting Ready for Christmas

Lovely vintage Hallmark interactive paper, trifold, standing Christmas advent calendar. Every day has a flap that pops open to reveal some text and an illustration. Cannot find another available for sale online. Looks like 1950s/60s. Has seen some love, reflective of age, but still in great shape. See photos for details. A charming, rare piece. When fully opened & flat: 21” w x 8.5” tall When closed 7” w x 8.5” tall