There's an ad in TN 22 for Archie "appearing in the December issue of Pep Comics" with an illustration of Archie, similar to how the character looked in Pep 22. Is this Archie's first published appearance? No mention of the ad in Overstreet.
GCD indicates pub dates for Pep as happening on the 15th of each month while Top Notch 20 & 21 are listed as on the 15th and 22 & 23 the 10th.
I checked a couple reference books but neither listed a precise date for the printing/distribution of Pep 22.
Going by the distributor codes on the Church copies from Heritage scans (except for Pep 22 & 23 where I used a magnifying glass and the Gerber Guide):
Top Notch 20 Aug 13
Top Notch 21 Sep 5
Top Notch 22 Oc