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Message:: [QUOTE="GDJMSP, post: 5002963, member: 112"]Someplace there's a book or an article that will have the tolerance information you seek. But I grant you, finding such information is often difficult. But keep searching, it's out there somewhere. As for this - A 0.2 gm difference may well be within specified tolerance for that coin. I say that for two reasons. One it's a fairly modern coin and modern coins typically have higher tolerance ranges, often much higher, than older coins do. For example, the tolerance range for Spanish 8 reales, and the Spanish were among the most strict there were when it came to tolerances, was 27.2638 gm to 26.8646 gm. That's a tolerance range of 0.3992 gm. So just by doing a rough comparison, 0.2 gm could easily be within tolerance for a modern coin. But, you'll need the book or article to confirm it.[/QUOTE]