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Eric BThe above link with caliper measurements is very interesting. If we go one step further, an standard measurement of the black boder can be done. Then we get a ratio of the card width and length to the border width and length.
At that point, wouldn't it be easy to measure a good scan of any card to see what the ratio, and consequently the complete card size is.
Then any famous card can be measured from a scan to determine trimming, if you know what I mean.