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<p>[QUOTE="-jeffB, post: 3980460, member: 27832"]Gotcha.</p><p><br /></p><p>1.8 grains is only a little over a tenth of a gram. Let's break down the possibilities.</p><p><br /></p><p>The Mint allows a certain tolerance (variation) in coin weights. For double eagles, though, that tolerance is very small -- <a href="https://www.coincommunity.com/forum/topic.asp?TOPIC_ID=251134" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.coincommunity.com/forum/topic.asp?TOPIC_ID=251134" rel="nofollow">0.5 grains</a>.</p><p><br /></p><p>Coins do lose weight through circulation, but <i>very</i> slowly until they're quite heavily worn. <a href="https://www.cointalk.com/threads/what-is-the-highest-silver-loss-on-barber-half-dollars-you-seen.292241/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/what-is-the-highest-silver-loss-on-barber-half-dollars-you-seen.292241/">One of our moderators carried a gold coin as a pocket piece until it was worn down to about F15, and reported that it lost only 0.003 grams</a>. This is still a topic of contention on the forum; some think that coins <i>can</i> lose more weight at earlier stages of wear, even if they don't <i>have</i> to.</p><p><br /></p><p>Most consumer-grade scales aren't super-accurate, and a 1/10-gram variance isn't surprising. What's the resolution of your scale, the smallest weight difference it can report? If you put a small scrap of paper on top of the coin while you're weighing it, does the reported weight change? Have you weighed the coin multiple times with the same scale, or weighed other double eagles with the same scale?</p><p><br /></p><p>Sorry for peppering you with questions, but I come from a chemistry background (among others), and I sometimes get all worked up about weighing things. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Bottom line: if NGC authenticated it (and the NGC slab itself wasn't fake), it's almost certainly real. The weight variance you see <i>probably</i> isn't cause for worry. But it's worth more investigation.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 3980460, member: 27832"]Gotcha. 1.8 grains is only a little over a tenth of a gram. Let's break down the possibilities. The Mint allows a certain tolerance (variation) in coin weights. For double eagles, though, that tolerance is very small -- [URL='https://www.coincommunity.com/forum/topic.asp?TOPIC_ID=251134']0.5 grains[/URL]. Coins do lose weight through circulation, but [I]very[/I] slowly until they're quite heavily worn. [URL='https://www.cointalk.com/threads/what-is-the-highest-silver-loss-on-barber-half-dollars-you-seen.292241/']One of our moderators carried a gold coin as a pocket piece until it was worn down to about F15, and reported that it lost only 0.003 grams[/URL]. This is still a topic of contention on the forum; some think that coins [I]can[/I] lose more weight at earlier stages of wear, even if they don't [I]have[/I] to. Most consumer-grade scales aren't super-accurate, and a 1/10-gram variance isn't surprising. What's the resolution of your scale, the smallest weight difference it can report? If you put a small scrap of paper on top of the coin while you're weighing it, does the reported weight change? Have you weighed the coin multiple times with the same scale, or weighed other double eagles with the same scale? Sorry for peppering you with questions, but I come from a chemistry background (among others), and I sometimes get all worked up about weighing things. :) Bottom line: if NGC authenticated it (and the NGC slab itself wasn't fake), it's almost certainly real. The weight variance you see [I]probably[/I] isn't cause for worry. But it's worth more investigation.[/QUOTE]
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