United States customary units mass: tower, apothecaries', troy, avoirdupois, and metric. Of these, the avoirdupois weight is the most common system used in the U.S., although Troy weight is still used to weigh precious metals. Apothecaries weight—once used by pharmacies—has been largely replaced by metric measurements. Tower weight fell out of use in England (due to legal prohibition in 1527) centuries ago, and was never used in the U.S. The imperial system, which is still used for some measures in the United Kingdom and other Commonwealth countries, is based on avoirdupois, with variations from U.S. customary units larger than a pound. The pound avoirdupois,
Texas Precious Metals Metals (NASDAQ: AMRK), a publicly traded precious metals wholesaler, to manufacture and distribute Texas Mint products to dealers throughout the United States. In 2014, Texas Precious Metals and the Perth Mint of Australia released the Houston-Perth "Sister Cities" coin, commemorating the strong ties between the cities' energy sectors. The half-ounce, 99.9% pure silver coin features offshore and onshore oil rigs showcasing the cities' historic energy sectors. The coin also pays homage to the flags of Texas and Australia. The coin measures 32mm in diameter with a thickness of 2mm, and has a legal tender face value of AUD$0.50. The coins