Now, come ooooonnnn, …… Mart, they were surely not made in a “machine shop”. But the “mold” or ”die” for making them would have been.
The were made from either plastic or aluminum.
If plastic, they were “injection” molded. If aluminum, they were “pressure” molded out of a round piece of aluminum about the size of a quarter ($). Just like beer and soda pop cans are made (with a larger Al disc of course).
If the “logo” (crown) is “pressed” (from the underside) into the top, they are aluminum. If molded onto the top, they are plastic.
And that’s my story and I’m sticking to it.