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I've been wondering when and how Batman and Superman reveal (or find out) each other's secret identities as Bruce Wayne and Clark Kent (in current comic continuity), and which issue(s) tell of this. The version of their first meeting as it is told in Man of Steel (mini-series) #3 (Nov 1986) -- I don't know if there are others -- doesn't have a mutual revelation of secret identities.
I did some web research, but what I found surprise me, mostly because I previously thought that Superman and Batman found out about each other early. The Superman FAQ has a question on who knows of his secret identity and says that "Batman discovered the secret (ADVENTURES #440, May 88)". I then browsed that site some more and found a three part article Superman & Batman: World's Finest Team, that takes a closer look at their relationship.
That article tells a bit more Adventures of Superman #440. It's apparently continued from Action Comics #594:
Superman asks for his help in trying to determine who has been keeping a scrapbook of his feats before his official debut as Superman (unknown to Superman, Ma Kent had been saving clippings, and her book had been stolen).Batman brings Robin along to meet Superman. It isn't clear whether this Robin is supposed to be Dick Grayson or Jason Todd. While Robin stands slack-jawed (repeatedly saying "wow!"), the two discuss the scrapbook.
[...]
Superman checks back with Batman in Adventures of Superman #440 for three pages. The meeting is made a bit edgier this time. Batman is in his Dark Knight persona, wondering where Superman is. "I don't like standing idle like this. Gotham is a garden that needs constant weeding". Batman doesn't bring Robin this time and he is abrupt with Superman ("As usual, your humor eludes me, Superman.").As to the scrapbook, Batman says that he wasn't able to come up with anything except, "the only absolute fact I was able to glean from the thing ... is that you're Clark Kent". Humorously, Superman's first thought is "Maybe I should have enlisted the help of the world's *second* greatest detective!" Batman adds that as a matter of "professional courtesy" he won't reveal Superman's dual identity to anyone.
Superman shows that there are some brains with the muscles when he replies, "Oh, I'm quite sure you won't do that ... Mr. Wayne." Batman almost slips off his batrope as he thinks, "and to think I took all that effort to line my cowl with lead foil."
Reading this summary confused me a bit. Both the Unofficial Guide to the DCU site as well as the Unofficial Chronology Site put this in present day, and make the Robin Jason Todd. Thus Batman didn't know Superman's identity until Year Seven (in the ultra compressed "official" DC timeline that seems to have a bizarre "10 years rule" ever more compressing events as time goes on) or even Year Nine (in the timeline constructed by the Unofficial Chronology Site, which attempts to be consistent wrt to actual events unlike the SF&O timelines), which is the year Jason becomes Robin.
While this is consistent with Legends of the DC Universe #6 which tells of the first meeting of Dick Grayson with Superman (and it isn't that scrapbook case), somehow I always imagined them finding out about each other much earlier. I vaguely remember reading stories set before Batman teamed up with the first Robin, where he still knew of Superman's identity. Right now I can only find ones which aren't all that central to other continuity and probably weigh less heavy, e.g. LotDK #24-26, Flyer, a story set explicitly 18 months after his debut as Batman, when he refers to Superman as Clark (LotDK #24 p.17), which I didn't even read until recently, yet I thought they learned each of other's identities early on even before reading that. And I'm not sure to what extent the World's Finest mini-series from 1990 written by Dave Gibbons was intended as in continuity or as standalone, but reading that fit with my impression (which apparently I can't fully trace right now) that Batman and Superman found out each other's identities early, because there's also no Robin, yet they know each other.
Are there other versions that explore the identity thing further or retell the version from 1987? I haven't read the World's Finest twelve issue maxi-series, does that one maybe cover it? I'd really like to read relevant issues covering this more in-depth than the Adventures of Superman issue mentioned above seems to do, though I guess I'm going to look for it too. So if anyone has further reading suggestions and/or more insight into this, it would be much appreciated.
(Note: I first posted about this a while ago, but moments later noticed I'd overlooked things, so I deleted that post and reposted after having read more, just in case you saw the previous post appearing and then vanishing on your flist and wondered about it.)