Vintage PROMISE MARGARINE Red Heart Plastic Measuring Cup Set

Vintage set of 4 red plastic heart shaped nesting measuring cups that were a promotion from Promise Margarine way back in the day. I remember that I had to collect so many UPC codes and mail them in to get these. The largest cup shows the most use. 1 cup, 1/2 cup, 1/3 cup and 1/4 cup. I welcome offers and I’m available to answer any questions.