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Message:: [QUOTE="10gary22, post: 1436566, member: 23626"]A few decades ago, I was fortunate enough to attend some basic math seminars at Cal Tech. The one that stuck in my mind was the "new idea" of measuring the area of an wierd shaped plane. They simply covered the area with a grid and counted the squares. They simply rounded off the squares that were only partly filled by area of the plane. This was at all the perimeter, of course. The smaller the grid sections, the more accurate the measurement. So why not cover the coin in question with a grid. Maybe even the one on the MS Paint program ? Count how many squares are covered by a perfect coin. The next grid would be over the offset one. Count the squares of the unstamped (or stamped, I guess) to determine it's area. Then you could determine very closely how much of the planchet was actually stamped. That area divided by the area of the whole planchet would give an accurate percentage of offset...........I believe. Say the entire planchet has an area of 300 by your grid measurement. The unstruck portion of the planchet has an area of 50 by that same sized grid.The struck portion of the planchet is now 250 grid squares. 250/300 = 83%.................so, couldn't you say it was offset by 17%, since only 83% of the strike was made ? Seems an easy way to determine it to me ? gary[/QUOTE]