1st appearance and origin of Captain America
1st appearance of James Buchanan Barnes aka Bucky, later becomes the Winter Soldier
1st appearance of the Red Skull, George Maxon, an agent of the true Red Skull
1st appearance of Doctor Reinstein aka Doctor Erskine, the inventor of the Super Soldier serum
1st appearance of Hurricane, later becomes Makkari
1st appearance of Tuk the Cave Boy, first offspring of the Inhumans
Introduction of Project Rebirth, the Super Soldier Program that eventually expanded into Weapon Plus
💰 In April 2022, a 9.4 sold for $3,120,000 (San Francisco Pedigree)