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IntroductionThis documentation is a tutorial for grading US coins using the 70 Point Sheldon Coin Grading Scale, the PCGS Photograde Online Service, and the NGC Coin GradingGuide. This will enable t … read more

The year 1776 marks the official beginning of the United States of America's nationhood. The year 1976, as the 200 year anniversary, was a big year for coins, including the Eisenho … read more

Improved Grading for AU CoinsThis article exposes a weakness with the About Uncirculated (AU) part of the 70 point grading scale and proposes a solution to improve it.BackgroundIn the previous days … read more

There are fundamentally two types of mint marks on US 1981 proof coins. These mint marks are used on all denominations from the Cent to the Dollar. The type 2 coins are more valuable than type 1 so it … read more

There are fundamentally two types of mint marks on US 1979 proof coins. These mint marks are used on all denominations of these coins from the Cent to the Dollar. The type 2 coins are more valuable th … read more