@angrycapitalist the vintage collectible silver market develops it's pricing based off of demand and collectability. The Arizona assay office ingots were part of the famous John J Ford Jr. and the Franklin Hoard. The numismatic value with the silver bar's is similar to coins. Based on rarity, condition, dates, and quality. There is just no "grey sheet" for silver bar's like there is with coins. Recent auction sales and private sales exceed 1700 on the Arizona assay office ingots. Appreciate you taking the time to ask this question. Enjoy the rest of your weekend✌