I added some info to deimos post:
Back covers:
Mono version --> Color version
B1 - Sutherland --> (didn't find this one yet)
C1 - Otus --> ? [Wizard confronting invisble coatl on pyramid]
D1 - Sutherland
D2 - Sutherland --> (
D1,2) Willingham [Mind Flayer/"Scarlet Witch" casting Color Spray]
D3 - Trampier --> Jeff Dee [Silussa Succubus & Belgos Vampire Drow]
G1 - Trampier ?
G2 - Trampier ?
G3 - Trampier --> (
G1-3) mini pics of
G1,
G2, and
G3S1 - Sutherland --> Otus [Party with Wizard about to put his head in Sphere of Annihilation]
S2 - Otus [adventurers approaching White Plume Mtn] --> Willingham ["Elric" with Blackrazor sword]
T1 - Trampier --> Jeff Dee [Two guys - same as 1984 PC Record Sheets cover]
Here's some trivia questions:
Do any of the tournament mods have back cover art?
What was the last TSR
mod to feature back cover art?
What was the last TSR
mod to have a product listing on the back cover?
UK1 has both (back cover art/product list); UK2 has neither; both are 1983, so it's sometime around then. Around then is when they re-designed the presentation to include the orange bar across the top (and put the same color on the hardback spine).