any idea when these Metal buttons were made and are they of any value?

[bronfamil_0]

Ive had these for decades.  They were in a huge box of old jewelry that i bought back in 2002.  Ive never done anything with them, but now am wondering, when were these made, or how old are they and are they worth anything over 20.00?   they are metal and a full round ball.

thanks!