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PCAssuming it the scan doesn't cut-off any of the edges, why should measuring the scan be unreliable? Especially when the scan is 100% larger than the actual card, where a difference in width would be even more exaggerated given the enlarged scale.
In any event, all we can go by is your scan, and your width differences cannot be confirmed using the enlarged scan you provided. How you found a 1/16 inch discrepancy on the actual card is beyond me, but you are right about one thing -- this discussion is foolish.