Board Thread:Support Requests - Community Management/@comment-24501028-20140408171727/@comment-366087-20140408175852

I've yet to try this myself, but the procedure should be: That one revision should be gone from the page's history.
 * 1) Make note of the timestamp of the revision you wish to erase
 * 2) Delete the Page
 * 3) Go to Restore
 * 4) Check all the revision entries you wish to Restore with the exception of the one you want erased
 * 5) *default setting is to restore all entries
 * 6) *for large histories, select the one to erase, then Invert Selection
 * 7) Restore

Note: I'm not sure if the process could ever *re-restore* a revision erased in this fashion, so make sure you get the right timestamp the first time.