heritage auctions

Coin Weights and Requirements under US Law – 31 U.S. Code § 5112

31 U.S. Code § 5112 - Denominations, specifications, and design of coins (a) The Secretary of the Treasury may mint and issue only the following coins: (1) a dollar coin that is 1.043 inches in diameter. (2) a half…
coin machine doubling coin world

Coin World Sneak Peak on Unique Machine Doubling Examples

An unusual case of machine doubling What is called “machine doubling” is a fairly common occurrence on coins and is a manifestation of press instability, writes Mike Diamond in his “Collectors’ Clearinghouse” column. The featured coin this week displays…
Banknotes Worth Far More than Face Value - Errors, Rare and Fancy Serial Numbers

20+ Banknotes Worth Way More than Face Value – Errors, Rare and Fancy Serial Numbers

Super-valuable US currency Collectors of American notes and coins pay eye-watering sums of money for the most desirable examples. From pennies and dollar bills you may just find lurking in your wallet or purse, to historically important rarities that…
clad coins

What are Clad Coins?

The half dollar, quarter dollar, and dime coins are clad coins with 3 layers of metal. The 2 identical outer layers are an alloy of 75 percent copper and 25 percent nickel. The inner layer is copper. The outer…