The nicer one's back stamp is 1940ish & has no chips,cracks, or major scuffing. Perfect for your collection. The newer one has wear marks & scratches(see pictures) They're both 9-1/2 inches You will be receiving both dishes for one money. These are the older pie dishes, all CAPITOL letters. Made with soda-lime, tempered, and borosilicate. Borosilicate glass includes boron trioxide, which has a low thermal expansion. This suggests unlike normal glass, it won't break when exposed to major temperature shifts such as taking a dish from a fridge to an oven. This is thanks to boron trioxide, the element that makes glass resistant to major temperature changes.