Subscription crease

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A subscription crease describes a specific flaw in the condition of a comic book, particularly a crease through the entire book running from top to bottom. It is a term commonly used by comic book collectors.

When comic book publishers began mailing comics directly to monthly subscribers they would simply fold the comic in half and stuff it into a standard #10 business envelope. This method was expedient and cost effective - the comic book business survived on razor thin margins - but resulted in a clearly visible line running from top to bottom of your favorite comic. The “memory” factor inherent in paper assured that this crease would be visible forever. Consequently collectors, who prize condition, consider this a defect that lowers the desirability of a particular issue.

This practice faded away in the early 1970’s when publishers found a marketing opportunity in mailing comics in larger envelopes, unfolded. Hence the appearance of in-issue ads touting that monthly comics were “Mailed flat!”