Quote Originally Posted by Kevin_Cook View Post
That is very odd ... it sounds like you dont have Gamescience dice ... as Lou Zocchi (the founder) was the one who first pressed that idea of fair number distribution
They might be early Gamescience dice.

Lou Zocchi's dice were not made with opposite sides adding up to n+1 until the mid-80s. His 6-siders had 1 opposing 4, 2 opposing 5, and 3 opposing 6. His original 20-siders, like everybody else's, were marked 0-9 twice, and each number was opposite itself.

I'm pretty sure of the timing. In 1985 or so, at Texcon, he sponsored a "polyhedrathon", with various prizes. I noticed then that his dice did not add up to n+1. But pretty soon after that they did.

(I won the prize for most unusual dice, with homemade d48, d60, and d120. The opposite sides added up to 49, 61, and 121, respectively.)