I've only spot checked this, but if I have any volume of the Anchor Yale Bible Commentary open and display the "Information" on the resource (or if I simply choose to display "Information" in the Library), it shows the copyright date as 1974 under the "Copyright" heading regardless of the book's copyright date. Other commentary series show the copyright date of the particular volume. (Other than the ICC, which often shows the Book's copyright year, but shows no copyright year at all if the volume is in the PD but does declare "Copyright T & T Clark" -- a statement that seems a bit ironic to me, but may make sense in reference to UK copyright protocols.)
So, in reference to the Anchor Yale Bible Commentary, if "Copyright" under the book's information isn't showing the copyright year of the book, what is it showing?
Thanks!