Sec. 291. Stamping with words “United States assay”, etc., unlawful. 292. Forfeiture. 293. Penalty for infraction. 294. Importation or transportation of falsely marked gold or silver ware prohibited. 295. Standard of fineness of gold articles; deviation. 296. Standard of fineness of silver articles; deviation. 297. Stamping plated articles. 298. Violations of law. 299. Definitions. 300. Application of State laws.