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There are slight differences in shape block maker to block maker. My long ovals are consistent but I have to be cautious as the variance in the regular ovals while slight can be significant.Yes, the original poster didn't say what size this was for. If it was for a specific size, say 7 1/4, we could figure out a ratio. Anybody have two of the same hatblock in the same size but different ovals to measure? But then, each hatblock manufacturer might use his own formula, kind of like the X's in felt quality.