Last modified: 2006-03-26 20:08:49 UTC
When you go to the diff for the first version of a page (such as http://en.wikipedia.org/w/index.php?title=Wikipedia:Esperanza&diff=prev&oldid=20848643) by clicking on the "← Older edit" link on the following version, the user information is missing. In the source code, <!-- ERROR --> appears where the username should.
Contrast with #5291, where on some other pages the "older edit" link leads to an "edit" where the oldest revision is on the new side and a revision from, say, six revisions and a year later is on the old side.