1909 Assay Commission Medal. Bronze. 55 mm x 49.5 mm. By George T. Morgan. JK AC-53. Rarity-5. Specimen-66 (PCGS).An especially attractive, fully original piece with deep golden-bronze patina. This medal represents an historic shift in materials used by the U.S. Mint, the introduction of true bronze alloy composed of copper, tin and zinc in place of the traditional bronzed copper. The new alloy was treated with sandblasting, whereas the bronzed copper pieces were often prooflike with mahogany or chocolate brown patina. One of just 51 bronze examples of the 1909 Assay Commission medal produced. The finest example of the issue that we have handled, and worthy of a premium bid. <p>
