[§482D-4] Standard of fineness of silver articles; deviation. (a) The actual variation of fineness of silver or alloy of articles made in whole or in part of silver or its alloys shall not be less by more than .004 parts than the actual fineness indicated by any mark (other than the word "sterling" or the word "coin") stamped upon any part of the article.
(b) No article shall be stamped with the word "ster", "sterling", or "sterling silver" or any colorable imitation thereof, unless the article contains .925 parts pure silver.
(c) No article shall be stamped with the words "coin" or "coin silver" or any colorable imitation thereof, unless the article contains .900 parts pure silver; provided, however: