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Sicherman dice are the only pair of dice marked only with positive integers that have the same probability distribution for rolling the numbers 2 through 12 as a standard pair of dice. The dice are labeled 1, 2, 2, 3, 3, 4 and 1, 3, 4, 5, 6, 8 pips (dots).
They were discovered by Colonel George Sicherman and reported on by Martin Gardner in a 1978 article in Scientific American. Their uniqueness has been proven mathematically. Laser etched and hand inked.