CREATE TABLE table_446 ("Character ( s ) " TEXT, "First Appearance" TEXT, "Cover Date" TEXT, "Publisher" TEXT, "Estimated Value" TEXT)

what's the first appearance where character(s) is iron man
SELECT "First Appearance" FROM table_446 WHERE "Character(s)" = 'Iron Man'
SELECT "First Appearance" FROM "table_446" WHERE "Character(s)" = 'Iron Man'