We were hoping someone might be able to shed some further light on this older piece of glass we found that is marked “Fry Oven Glass.” We do know that the Fry Glassware Company got a license to make Pyrex in the 20s, which is why we’ve included it here. Our piece is a Fry Oven Glass 1 quart casserole without the lid (you can see the markings clearer on the ref page). If you’re an expert on Fry Glass and know more about it, please let us know… this is the first piece we’ve come across in a thrift shop.