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There were 20 sided D10s.  Those actually came first.  It was suggested that you roll a D10 and a D6 together.  a 4+ on the D6 indicated that you add 10 to the result of a D20.  That was in the mid 70s.  The D20 came soon after in the late 70s.  I remember using those in highschool.  c1979-1983.  The actual D10s with only 10 sides came out sometime in the mid 80s…best guess.  I remember seeing them for the first time in college.  Probably 1984 or 85.


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