Without any intention to hijack the thread...I have learned that Milkies, Prima Agates, Opal Agates and Cerise Agates were very early Peltier (circa 1924 onwards) production. It is interesting to note that Primas, like Clyde mentioned, look like American Agates and nothing like Peltiers. There is a large number of them out there too to counter the thought of they are very early rare Peltiers. Hmmmm...
Sami