On-sale date from copyright registration.
At Camelot. Rewrite of #144's Shining Knight story.
Possibly Ramona Fradon's first work at DC. In an interview at http://www.wtv-zone.com/silverager/interviews/fradon.shtml she says that her first work at DC was "a four page Shining Knight", but none of the Shining Knight stories were 4 pages and this is the earliest Shining Knight story she worked on.
Inside back cover.