Batman The Dark Knight Returns 1 - 4 First Printing Complete Series For Sale

Batman The Dark Knight Returns complete series issued 1 - 4 first printing. I bought these at a comic shop around 1988 as a set and never read them. This might literally be the first time they've been out of the bags since I bought them. I bought the softcover collected version at the same time and read that a zillion times but I know I never read the actual issues. They're in really nice shape except the first issue has a dent in the middle of the cover that I never noticed before. I've included a close up of the spot in my photos.