Detective Comics #419 Unbound Cover Proof, Signed by Neal Adams

This is a fully intact, unbound printer's proof (cover flat) for Detective Comics #419, featuring iconic Batman cover art penciled and inked by the legendary Neal Adams. 
What makes this piece exceptionally special is that it is the complete exterior wrap of the comic exactly as it came off the printing press, including the interior black-and-white advertisements and a vibrant Aurora AFX Racing Set ad on the back cover with a 1971 copyright timestamp.

The front cover is signed by Neal Adams right across the center, perfectly placed just below the Detective Comics logo. It is a pristine survivor from the early 1970s and a fantastic artifact of Bronze Age comic production.