Vintage Butterfly Applique Quilt Blocks: 1940s Embroidered Fabric, Set of 13

Thirteen antique, circa 1940s or early 1950s, Butterfly Applique Quilt Blocks. There are discolorations/spots on several of the blocks that should come out with a soak - please see photos. Otherwise in good shape.

Each measures 9 inches by 9 inches.