Started 4th Mar 1939, ended 16th Feb 1963. Merged with Magnet 1941, became Knockout and Magnet until 1945, then just Knockout again. Merged with Valiant.
Numbering based on comic number until later issues when the numbering was dropped in which case year-month-day of issues are used instead.
Knockout was revived 8 years later by IPC Magazines.
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