Overstreet Price Guide in the 80's stated that these are extremely rare even scarce.this was stated back then. (HARDCOVER) Editions that is. On the COMICBOOKPRICEGUIDE web sight the values stated in 9.4 condition of these hardcovers are as follows. Detective comics #27 IN 9.4 =$320.00 9.8=$640.00 this is the most valuable of the lot. Action comics 1, Whiz Comics #1 Wonder Woman 1 , Batman 1, Sensation Comics 1 are all values at 9.4=$240.00 9.8=$480.00 .Lyle Stuart Inc.was the publisher of the Hardcovers and are referred to as such. These Hardcover books I believe are the 1st time any of these were reprinted entirely as the original books except for the larger dementions of 10' x 13' 1/2. I personally have been looking for high grades of these Hardcovers over thirty years. I have never seen of or heard of anyone ever having a Hardcover of the BATMAN 1 and believe that they do not exist and were never printed there are many photo's of the other Hardcovers on google images but this book has none. I believe that this book has been mistakenly listed as existing. These comments have been posted on March 31st of 2019 so prices may change.