In zmacs in System 98.37, CADR 3.6, ZMail 53.13, MIT-Specific 22.0, microcode 309, ZM MIT, on Lisp Machine Thirty: c-X c-B fails to show the file version number for the file oz:<emacs>teco.0 which I got by doing m-X tag search, using the oz:<emacs>teco.tag file.