§ 229-h. Marking watch cases 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 comprised of works or movements partially concealing said works or movements marked, stamped or branded with the words "coin" or "coin silver," unless said case or covering shall contain not less than nine hundred one-thousandths parts of pure silver, is guilty of a misdemeanor.