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Message:: [QUOTE="GDJMSP, post: 2097993, member: 112"]LOL ! A mistake ? You are kidding, right ? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" />  The book is full of these "mistakes" ! And Paul, what causes wear on a coin, what you call wear ? And yeah, I mean a coin that is in actual circulation, being used in a store as change - what causes the wear on the those coins ? The answer is really pretty simple, wear is caused by friction between the coin and some other object. Yeah, that's right, friction is THE bad guy, friction causes wear. And it is friction with anything that causes wear on a coin. So for the TPGs to use "friction" as another name for wear so that they can grade a coin with this "friction" as uncirculated - well, the idea is ludicrous. Friction is wear, period. Wear is caused by friction. And no, there is no difference between the friction of a coin against the paper of a roll, or against the canvass of a bag, or against the sides of a cashier's change drawer, or against cotton of the inside of my pocket - it is all still wear. And it is all caused by the friction of the coin against these other surfaces. What I refuse to accept, what anybody with any common sense should refuse to accept, is that wear from this or from that doesn't count. It is still wear, so of course it counts.[/QUOTE]