Antique Salt And Pepper Shakers Iridescent 1921 Signed M. Evans 2" tall No Corks

These salt and pepper shakers are in excellent condition. The only issue is that they don't have their corks in them. They do have an iridescence look to them. I'm unsure of the material they are made out of. I seem like a ceramic-type material, whatever they used to use in the 1920's. Please see all photos.