Amazing Spider-Man #40 (1.8)

Title: Amazing Spider-Man
Issue: #40
Publisher: Marvel 
Year: 09/1966
Grade: GD-1.8, Tape repairs to covers and interior

Origin of the Green Goblin

Spider-Man battles the Green Goblin. While battling, an explosion erases the last several years of Norman Osborn's memory, reverting him to his pre-Green Goblin state.