The 1923-S Authentic Monroe-Adams Commemorative 90% Silver Half Dollar Coin weighs 12.5g and is composed of 90% silver with a fineness of 0.9. This coin, minted in San Francisco, is a part of United States history and is a commemorative piece featuring the Monroe variety. As a circulated coin from 1923, it holds value not only for its silver content but also for its historical significance. Right now, this unique piece is a valuable addition to any coin collection, especially for collectors interested in US commemorative coins.