1 oz Copper Bar - Walking Liberty 1 oz Copper Bar - Walking Liberty Product Details The "Walking Liberty" design, used on 90% silver half dollars from 1916 to 1947, is one of the most iconic designs in American coinage. These 1 AVDP ounce copper bullion bars feature a design that recreates this classic beauty. AVDP Explanation "AVDP" is an abbreviation for the unit system "Avoirdupois." This is a commonly used unit of mass, especially prevalent in the United States. 1 AVDP ounce (oz) is equivalent to approximately 28.3495 grams. In this context, it indicates the weight of the 1 AVDP ounce copper bar and is used to clarify the product's characteristics. Bar Features: Contains 1 AVDP ounce of .999 pure copper. Obverse: Recreates the iconic Walking Liberty half dollar from the mid-1900s. Reverse: An elaborate shield design featuring an eagle's wings against a three-star American shield. The surrounding rope ring is inscribed with "Copper," ".999 fine," and "One AVDP oz." Please contact us in the comments if you would like multiple bars.