Timless Springform Pans

This was another surprise, this time inside a cookbook. I don't know how long Spring Form pans have been around and  quick search online didn't come up with anything. Anyone know? It is hard to tell the age of the tag its self, though becasue it mentions aluminum maybe the 50s.

 

 Isn't that neat it comes with different pan bottoms? That certainly makes it space saving. And one doesn't have to debate whether it is worth keeping an angel food cake pan that is only used three times a year.

 I wonder if they still make them with the interchangeable bottoms.......... I need a set!