MARVEL X-MEN #6 CGC SS 5.0 SIGNED BY STAN LEE KEY ISSUE SUB-MARINER APPEARANCE. BEAUTIFUL MID GRADE KEY X-MEN ISSUE. The item "MARVEL X-MEN #6 CGC SS 5.0 SIGNED BY STAN LEE KEY ISSUE SUB-MARINER APPEARANCE" is in sale since Saturday, March 28, 2020. This item is in the category "Collectibles\Comics\Silver Age (1956-69)\Superhero\X-Men".The seller is "rzrbldmn" and is located in Phoenix, Arizona. This item can be shipped worldwide.