Overstreet Comic Book Price Guide

The Overstreet Comic Book Price Guide (or Official Overstreet Comic Book Price Guide) is an annually published comic book price guide widely considered the primary authority on the subject of American comic book grading and pricing in the hobby/industry. Many observers tie in the growth of the direct market distribution system and comic book specialty shops to the general acceptance of Overstreet's annual guide as a standardized inventory and pricing system.

Begun in 1970 by Robert M. Overstreet as a guide for fellow fans of Golden Age and Silver Age comics, the Overstreet guide has expanded to cover virtually the entire history of the American comics publication as far back as the Victorian Age and Platinum Age. The annual edition also covers promotional comics (giveaways and advertising) and "big little books," while continually updating new publications and market reports that cover the prior year of market activity.

Overstreet's annual guide to the comic book collecting hobby has itself become a collectible, and since the 1980s each edition of the Price Guide includes a page listing collector's values for older editions, with hardcover editions, in particular, selling for a premium. Currently, the Price Guide is published in three formats: hardcover, softcover, a larger, ring-bound edition and an electronic edition, often with multiple covers for each version.

Robert M. Overstreet grew up as a comic book, coin, and Indian arrowhead collector. In the 1960s, after abandoning a project to create an arrowhead price guide, Overstreet turned his attention to comics, which had no definitive guide.

Comic back-issue prices had stabilized by the end of the 1960s, and, Jerry Bails, who had recently published the Collector’s Guide to the First Heroic Age, was considering creating a comic book price guide. He was contacted by Overstreet, who was doing the same thing. Bails' extensive notes, supplemented by Overstreet's study of dealer listings, "became a backbone to the Overstreet Comic Book Price Guide."

...
Wikipedia