A coin blank is the metal disc onto which a coin will be struck. The blank is punched in its round form from a strip of machined coin alloy, and then processed through the upsetting mill, which raises the proto-rims on the blank and turns it into a planchet.
A coin blank that doesn’t have the proto-rim used to be called a Type 1 blank. The planchet was called a Type 2 blank. Although these terms are rarely used in conversation anymore, you will occasionally see them on grading service holders.
