This no. 9 Griswold large logo heat ring was made in the 1920's and measures 11" in diameter. It sits almost perfectly flat and would be fine on a glass top stove. It has obvious heavy sulfur pitting on the logo and some pitting on the cooking surface. It would still cook great though. I took pictures in the lighting to highlight any flaws.

This pan was cleaned to bare iron with electrolysis and seasoned 4 times and is ready to use.