These have been kept by the original owner in a non-smoking home. I feel they are in excellent shape - no damage or tears noted.
I make no claims to how they would be graded. Issue #1 says it is SECOND PRINTING. The Indica (info on inside cover) of #2, #3, and #4 does not mention which printing #, so possibly FIRST PRINTING. I recall there was some controversy regarding issue #2 having a second print run that did not specify.
I do not feel qualified to compare the shading of the pages to a reference to determine this. Best that you assume it. Could be SECOND PRINTING as well. The item "Batman the Dark Knight Returns, Books 1-4, 1986 NR" is in sale since Friday, September 28, 2018.
This item is in the category "Collectibles\Comics\Copper Age (1984-1991)\Superhero\Batman". The seller is "scottrn3" and is located in Winter Garden, Florida. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.