The on-sale date is from the publication date recorded in the Catalog of Copyright Entries, Part 2, Periodicals, 1945, New Series, Vol. 40, No. 1, p3-4.
Captain America [Steve Rogers]; Yellow Claw (villain, not the 1950's villain); Yellow Claw's Mole-Men (first appearance, villains)
Synopsis
Yellow Claw creates a chemical which dramatically increases the size of men's hands, making them into Mole Men which he uses to tunnel under munitions plants and wreck them. When he plans to use explosives in a lava pit to create a new volcano under a munitions plant, Captain America and Bucky see that they meet their doom inside the lava pit.