Batman #47 - The Origin issue.
Batman #47 (DC, 1948) CBCS VF+ 8.5 White pages.
You have to go back to the very early issues of the title to find a more highly valued issue. The origin of Batman, in which Batman tracks down Joe Chill, the man who killed his parents! A supremely important issue. It also marks the first appearance of the Bat-Signal on a cover. Iconic in every single way. Rare in any state, rarer still with an 8.5 rating. A serious collector's piece.
Creator Bob Kane gets credit for the cover, and he collaborated with Lew Schwartz for most of the interior art.
CGC has certified quite a few copies of issue #47, but to date has given a higher grade to only one other copy.
Publication date: 1948.