Moon-Lancer
First Post
Monster Manual (1977), p. 46:
Per the Players Handbook (1978), "studded leather or ring mail + shield" (or "scale mail" without shield) should be AC 6 -- one worse than the above.
The MM, though, was written in line with the original system (starting at AC 9 instead of AC 10). Nearly all monsters retained their old Armor Class (as well as Hit Dice, Move, and Damage/Attack.). Thus, old ACs 6-9 got an effective "+1 bonus" relative to the new factors (7-10) for leather and shield, leather or shield alone, or no armor.
(Monsters casting spells as if clerics or magic-users also follow the original progressions for those classes rather than the PHB ones.)
Thank you SOO much. I do not have access to these older versions of D&D.