All products have a unique code:
Chaosium Pendragon Product list
CHA2701 King Arthur Pendragon 1st edition
CHA2701 King Arthur Pendragon 2nd edition (Never made)
CHA2702 The Pendragon Campaign
CHA2703 The Noble's Book
CHA2704 The King Arthur Companion
CHA2705 The Grey Knight
CHA2706 Tournament of Dreams
CHA2707 Knights Adventurous
CHA2708-1 The Boy King - 1st Edition
CHA2708-2 The Boy King - 2nd Edition
CHA2709 King Arthur Pendragon 3rd Edition
CHA2710 Savage Mountains
CHA2711 Blood & Lust
CHA2712 Perilous Forest
CHA2713 Pagan Shore
CHA2714 The Spectre King
CHA2715 Castle of Bones (Never made)
CHA2716 Pendragon Fourth edition
CHA2717 Beyond the Wall
CHA2718 Land of Giants
CHA2719 Lordly Domains