At least 2-3 times a week, we get a phone call asking this simple question: "What is the different between a Proof and an Unc coin?" Hopefully this guide will help you in understanding the key differences to distinguish between these two different finishes.

First, we will start with the Unc, or Uncirculated, coins, as this is the easiest to distinguish. If you were to take out a fresh penny from your pocket, this is what we would call an Unc or Mint State coin. These two terms are synonymous. Generally, Uncs are coins that are produced for circulation. Nothing special is done to prepare the dies or the planchets, and usually no special care is taken to preserve the quality of the coins. However, with coins such as American Eagles and Buffalos, and Modern Commemoratives, the finish of the coin is slightly different. These coins are still considered Unc, but have had some special preparation to make them appear different. The Mint will finish the dies to give these coins a smoother Satin Finish to the coins, such as this:

Now, we can move on to the Proofs. For Proof coins, the Mint takes much more special care of the coins. These coins are always struck with the express purpose of being sold to Collectors. Several things are done to ensure this special look to these coins. The dies are prepared by polishing them. The fields (All the flat areas of the coin) are polished to the point of looking like mirrors. The planchets receive similar treatment, and are also polished to help the coins achieve that deep mirror appearance. In addition, the coins are sent through the press more slowly and are also struck twice to ensure that every detail is crisp and full. The coins are then also handled with great care, so as not to leave any marks on the coin. Here is an example of a proof coin. Notice that in the picture, all of the fields appear black, much like what sometimes happens when you take a picture of a mirror.

This past year, the Mint also issued for the first time a "Reverse Proof" coin. The Reverse proof is prepared in much the same way as the normal proof coins, except that the devices are mirrored while the fields are frosted like a Mint State coin. Only the $50 Gold Eagle and $1 Silver Eagle were produced with this finish and were only available in the Gold 3 Piece 20th Anniversary Set and the Silver 3 Piece 20th Anniversary Set.

We hope that this guide has been helpful to you in learning to distinguish between these three different methods of maufacture. Happy collecting!