The on-sale date is the publication date reported in the U. S. Copyright Office filing.
An earlier indexer provided an on-sale date of July 13. No citation was given, although another indexer notes that it matches a listing in the fanzine The Comics Reader.
This issue has variants:
Captain America [Steve Rogers]; Falcon [Sam Wilson]; Leila Taylor; Texas Jack Muldoon; Night People [Brother Inquisitor; Brother Wonderful; others]; Sharon Carter