How do you tell if a bowl is oven safe, if it does not say anything on it? (it is an older bowl, white glass)?

I am trying to make a Pumpkin Cake and it calls to be baked in a glass bowl. I was wondering how you tell if the bowl is oven safe. Most of the newer dishes say on them oven safe or micro safe or if they are not. This bowl is probably from the 70’s (my grandma gave it to me) and it does not say anything on the bottom. It is white in color and thick glass of somesort. There are no embellsihments on it. I need to get this cake made asap!! Any suggestions would be greatfully helpful. Thank you for looking!!