A planchet English: /ˌplænˈtʃət/ is a round metal disk that is ready to be struck as a coin. An older word for planchet is flan. They are also referred to as blanks. Please read the entire thread. There is a quote from errorref.com that confirms what I said.
The word "clip" had a ton of meanings: clip klĭp intransitive verb To cut, cut off, or cut out with or as if with shears. To make shorter by cutting; trim. To cut off the edge of. To cut short; curtail. To shorten (a word or words) by leaving out letters or syllables. To enunciate with clarity and precision. To hit with a sharp blow. To block (an opponent) illegally from the rear. The American Heritage® Dictionary of the English Language, 5th Edition.