Only denoted as part of the A-1 series on the cover.
The date entered in the "On Sale Date" field is the copyright date derived from the actual Library of Congress copyright documentation (available on www.archive.org).
Indexed from a scan from http://goldenagecomics.co.uk/.
The first three issues are part of the A-1 series. Refer to A-1 (Magazine Enterprises, 1945 series) #17 for this issue.