Hi Paul,
Smart did make quite a few items that appear to have used patterns made from Griswold or Wagner items. I have one Smart skillet I could have sworn was a Griswold, until I cleaned the crud from the logo.
I have only seen a couple of these on EBay over the last few years, and they went for around $50, if I remember right.
I think you should hang on to it. You will see a ton of Griswag stuff before you find another one of these.
Chris