Issue 176, page 17.
Artist: David Wenzel
Inker: Pablo Marcos
Avengers 176, cover dated October, 1978. Titled "Destiny Hunt," it's the next-to-last chapter of the justifiably classic "Korvac Saga." This is one of my personal all time favorite "bits"- with the government having pulled all the Avengers travel rights, and their just having discovered the location of the most powerful foe they've ever faced, Iron Man rallies the troops, crying "Avengers Assemble... uh, on the corner outside." Cut to this page, as Iron Man commandeers a New York City bus, and the Avengers board and head off to find the villain...
Running right to left across the top panel: Starhawk, Iron Man, Yellowjacket, Moondragon, Wasp, Black Panther, Jocasta, Captain America, Thor, Quicksilver, Hawkeye, Hercules, Black Widow, Ms. Marvel, Wonder Man, Captain Mar-vell, Vision, and the Scarlet Witch. Eighteen of Earth's Mightiest Heroes, all told.
Purchased on EBay in May of 2005. I guess its my graduation present to myself, considering that this cost me more than any two of my other pages put together. :(