This listing is for a #49 copy of Unknown Worlds, published by American Comics Group from 1966.   It is in NM condition including the back cover.  I am listing this as 9.2 NM rather than 9.4 NM because there is very minimal wear along the right side of the front cover and a very light tan line up about 1/4" on the back cover with no color loss in either place.  This comic was read, put in plastic and boarded for decades.