A 120

[Chris McCarver]

Iron Man's the only character for which this issue is split, namely by CA 171, wherein he appears in a brief cameo to let the Falcon know that Captain America's presently a fugitive. During A 120, Iron Man appears alongside the Avengers when the team is attacked in their own mansion and leave the unconscious heroes a taped message that they're going to compel every Gemini-born Manhattanite to commit suicide at "midnight that night." Following that scene, "some time later," the Zodiac is setting up a device that will carry out their threat atop the World Trade Center, after which the Avengers arrive and engage the Zodiac until the cliffhanger ending. I'm thinking Iron Man's cameo fits between the scene where they listen to the Zodiac's tape and the scene where the Zodiac are setting things up at the Towers. Therefore...

IRON MAN/ANTHONY EDWARD "TONY" STARK
[...]
A 120 (1 - 14)
CA 171
A 120 (15 - 19)
[...]