Tupperware Bread Keeper, Vintage, Patent Pending

Tupperware Bread Keeper, Vintage, Patent Pending. This is a unique piece from the 1950’s. This was produced while the Tupper Company was awaiting their patent on their seal for the storage containers. How many people do you know that have Tupperware that says “Patent Pending” on the lid?? In good vintage condition. My mom was the original owner. Size: 11.5” x 6.5” x 5.5”.