The Revere Ware square skillet is one of the most iconic pieces they ever made in the vintage period. Nothing exemplifies this more than this ad (a framed copy of which is hanging in our kitchen.)
They aren’t common and they aren’t inexpensive. But if you are a serious collector, it is a must have item.
There are a couple of them on eBay right now with lids that should polish up nice; they are from the same seller in fact. (Click on the images below for the eBay links.)