I have uncovered several patterns that originated from the Home Economics Department or the Educational Bureau of William Prym, Inc, as this one does. Probably dating around the late 40's because the company first introduced the "Cover-Your-Own" buttons, snaps and buttons after 1946. This little gem is a whimsical take on a once useful accessory. And what a creative way to sell buckles and buttons.
I don't know how these patterns got into peoples hands. Were they high school Home-Ec projects? I have searched newspaper archives and they do not appear to have been mail order. I have several packages of the buttons and buckles and none have any offers for patterns. I did see an advertisement for a sewing fair that had representatives present from many companies including Singer and Prims. They were doing demonstrations of their products and perhaps that is where they originated? The mystery continues.
For a pattern and instructions to make this nostalgic clothespin caddy click HERE.