Titl e: Justice League of America Issue number. 1st Silver Age appearances of Hourman and Dr. Cover pencils by Mike Sekowsky, inks by Murphy Anderson.Script by Gardner Fox, pencils by Mike Sekowsky, inks by Bernard Sachs; 3 villains each from Earth-1 and Earth-2 hatch a plot to commit crimes, then hide out on the other Earth; To ensure their success, the villains of Earth-1 mystically trap the JLA in their headquarters; But the JLA summons the JSA and switches places with them. The item "JUSTICE LEAGUE of AMERICA #21 Grade 6.0 1st Silver Age Hourman & Dr. Fate" is in sale since Friday, May 11, 2018. This item is in the category "Collectibles\Comics\Silver Age (1956-69)\Superhero\Justice League of America". The seller is "css1016" and is located in Vancouver, Washington. This item can be shipped worldwide.