New York Laws
Article 13 - Silver, Gold and Diamonds
229-G - Marking Watch Cases Sterling or Sterling Silver.

§ 229-g. Marking watch cases sterling or sterling 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 comprised of works or movements
and a case or covering applied or attached thereto, wholly or partially
concealing said works or movements marked, stamped or branded with the
words "sterling" or "sterling silver," unless said case or covering
shall contain not less than nine hundred and twenty-five one-thousandths
parts of pure silver, is guilty of a misdemeanor.

Structure New York Laws