Harris confirmed as editor per his biblio in Robin Snyder's The Comics!, Vol 29, No.5, May 2018.
Indicia title is "THE BIG CIRCUS, No. 1036." Code number is B.C.O.S. #1036-598. Copyright 1959 by Saratoga Productions.
"Movie Classic" on cover. Adapted from the 1959 movie "The Big Circus".
No month is given on the cover or in the indicia. Based on the copyright dates of this issue and others in the series released around the same time, one can determine that this issue was published with other Four Color issues bearing an "August-October 1959" cover date.
On sale date is Library of Congress copyright record publication date.