New York Laws
Article 13 - Silver, Gold and Diamonds
229-D - Marking Soldered Metal Coin or Coin Silver.

ยง 229-d. Marking soldered metal coin or coin silver. Any person, firm,
corporation or association who makes or sells, or offers to sell or
dispose of, or has in his or its possession with intent to sell or
dispose of, any article of merchandise, whose component parts are made
of the same metal soldered together, which article is marked, stamped,
or branded with the words "coin" or "coin silver," unless all of said
component parts shall contain not less than nine hundred one-thousandths
parts of pure silver, is guilty of a misdemeanor.