HI Gene, The "coin" is a factory/vendor added{as in welded on} metal tag with the last two digits of the K member part number.. Depending on the year/application the coin could be round or oval..Not all K members got the coin,most would have a modification like an added skid plate or a reapplication from the original intent... Fastmark, yes at one time RestoRick was selling the coins complete with the stamping for the application..I didn't realize he wasn't offering these anymore either..