Yep, no question there, Ducksterman.
Unless one wanted to use it as a catch for trimmings. (My eye, My EYE!)
All the ones I've seen were similar to your picture. So I assumed the frame went on top.
You know what they say about a$$-u-me.
I do like them worn with the frame on the bottom. It just never occurred to me to wear them upside down before.
So Cornfusing!