On Sale Date from the publication date reported to the Catalog of Copyright Entries, Third Series, Volume 22, Part 2, Periodicals, January-December 1968. Copyright number B474890. Copyright given to Olympia Publications, Inc., Marvel Comics Group.
Mandarin figure drawn by John Romita. The original, unaltered cover can be seen on Marvel Super-Heroes #61. Info per Nick Caputo, August 2012.
According to Herb Trimpe in his introduction to Marvel Masterworks Incredible Hulk volume 4, Marie Severin provided layouts for him.