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Message:: [QUOTE="Hobo, post: 1436427, member: 11521"]This came up in another thread and I thought it might be worthwhile to start a thread on the topic. There are two schools of thought as to how to calculate the percentage a coin has been struck off center: 1) Measure the distance the coin has been struck off center (e.g., edge of coin to edge of where the die struck the coin or center of coin to center of the design) and divide that by the diameter of the coin then multiply by 100. 2) Divide the area of the unstruck portion by the total area and multiply by 100. The two methods give very different results. For example, assume a coin was struck off center such that the center of the die is exactly at the edge of the planchet (and the edge of the die is at the center of the planchet). If you calculate the percentage off center using method 1 you would say the coin is 50% off center. However, if you calculate the percentage off center using method 2 you would say the coin is much more than 50% off center, perhaps 65% to 70% off center. So which is the "official" way to calculate the percentage a coin has been struck off center? Please indicate whether you know the answer or whether you just think your method is correct. If you know the correct answer please provide a source (if possible).[/QUOTE]