All of the coins in my circulated collections, US and Foreign, I keep in cardboard 2×2′s. These 2×2′s are cardboard with an inert plastic lining that you staple around the coin to keep air from passing around the coin’s surface. Keeping the air from moving across the coin’s suface is more important to the coin’s preservation than keeping it in a container that is air tight. The 2×2′s can then be kept in boxes or, my favorite, in clear plastic pages that hold 20 of them and fit in a three ring binder. After placing a coin into a 2×2, I like to use a pair of pliers to flatten the staples, being careful not to touch the coin with the pliers. I found that If I don’t do this, the 2×2 is harder to slide into the page’s pouch, and once in, the back side of the staple pokes at the page it is in, creating a dent. Worse yet, if you are keeping the 2×2′s in a box, the staple could poke at the surface of an adjoining coin, if not flattened. As I mentioned above, I keep my coins in three-ring binders. For my US coins, I slide the 2×2′s into the pages sideways, so that the “top” of the coins are toward the rings (the spine of the binder). Since US coins are minted “coin turn style”, this storage method allows the obverse and reverse to both be viewed right side up when you turn the pages away from you (like flipping the pages of a calendar, as opposed to flipping the pages of a book).
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