1909 U.S. Assay Commission Medal JK-AC-53 NGC MS67
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.
This was the final plaque issued for the Assay Commission. Beginning in 1910 and continuing through 1975, all Assay medals reverted to the familiar round shape. The obverse has a bust of George B. Cortelyou, facing right, with SECRETARY OF THE TREASURY below. The reverse is the same design used earlier in 1905, except for the changed date. Attractive yellow-bronze.
This is a sharply struck example, unlike the 1960s-era restrikes that were more softly detailed.