Glass Serving Dishes How Do I Know If These Dishes Are Oven Safe For Baking?

How do I know if these dishes are oven safe for baking? - glass serving dishes

I use a collection of glass plates and bowls for things baking in the oven, but I do not know whether they are safe to cook in the oven. They are made of glass, glass is clear, a golden color. I looked down to see if it safely labeled Pyrex or oven, but everything he says, is Mexico, and 20, and 27 in another. The glass is very thin. I hope the cooking candied sweet potatoes and green beans in them. One is to give the shape of a circle and the other is like a big bowl.