This issue is a variant of Detective Comics (DC, 1937 series) #572 [Direct Sales].
"50 Years" anniversary issue.
On-sale date from DC Releases #34.
Color credits confirmed by Anthony Tollin.
Has framed cover to Detective Comics (DC, 1939 series) #1 on wall.
Introductory text to the issue. Located on inside front cover.
Double page spread located in center of issue.