Three double-sided cardstock cards with charts and tables for use with D&D. Reportedly the first published gamemaster screen.
From the cover sheet:
"Game aid approved for use with Dungeons & Dragons."
"A ready reference screen for fantasy game referees. Three cardstock panels include: Attack matrices with minus armor classes, saving throws, weapons' strikes & damages, weapon priority, phantasmal forces, encounters, experience points & levels, monster compendium of statistics."