Definition: 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.
When referring to ancient coins, or coins made on cast metal discs, the term flan is frequently used instead of blank or 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.
When referring to ancient coins, or coins made on cast metal discs, the term flan is frequently used instead of blank or planchet.
Examples:
The blank must be turned into a planchet before it can become an actual struck U.S. coin.