Back in the day, d10’s were icosahedra numbered 0 to 9 twice. A good one had the two sets of digits in two colors, so it could be used as a d20 by interpreting one color as +10 (of course 0 counted as 10 except when using them as halves of a pair of percentile dice).
I played AD & D in high-school and when home from college, though hex-grid wargames were and are my chief vice. I DM a v. 3.5 campaign for my son and his friends. Personally I think the game system is too baroque: no need for tables was a good innovation, but feats and skills and prestige classes clutter the thing up.
Memory eternal, Gary G.
Old school D&D is still the best, from what I’ve seen of this new stuff. Don’t tell me an Orthodox Christian digs this johnny-come-lately malarky!!?? Have you ever seen Dragonsfoot.org? Tons of folks still rollin’ dice like it was 1979, including free fan written modules that can kick the butt of a party of adventurers level 9-12 slicker’n a huge red dragon with surprise. Heck, Gary Gygax was a regular poster, as well as other early D&D scions.
Freegards, you Orthodox on FR rule!