Thor First Appearance: Journey into Mystery #83 and How to Identify It

Thor first appeared in Journey into Mystery #83 (cover date 1962), published by Marvel, by Jack Kirby, Stan Lee, Larry Lieber. The source puts it this way: "Published in 1962 by Marvel Comics, the book features the debut of Marvel's Thor by Jack Kirby, Stan Lee and Larry Lieber.".

• Creative team credited: published in 1962 by Marvel Comics, this issue features the debut of Marvel's Thor, created by Jack Kirby, Stan Lee, and Larry Lieber.
• Origin story premise (interior content): the story introduces him as the Norse god of thunder, sent to Earth by his father, Odin, to learn humility under the guise of Dr. Donald Blake.

• Indicia: the small print on the first page or inside cover gives the issue number, date and publisher; reprints usually say so there.
• Cover price and barcode: a price or barcode format that did not exist in the year printed means a later edition.
• Paper and staples: decades-old newsprint is tan at the edges; bright white pages on an old date are a warning sign.
• Restoration: color touch, trimmed edges and married covers are common on expensive keys; a grading service can detect them.

Shoot the front cover flat, straight on, in even light, then the indicia page and the back cover. Include the top edge and staples in one frame. The app reads the title, issue number and cover and matches it against the checks above; the indicia photo settles most reprint questions.