How to tell a first series (1-80 print) 1952 Topps Baseball Card pack.

This first series (1-80 print) 1952 Topps Baseball Card pack is recognized as "first series" by the ad on the back for "Felt Baseball Emblems" and the samples of Brooklyn Dodger and New York Giants emblems.
Most unopened 1952 Topps Baseball Card packs will be of
unspecified series.
An example of the unspecified series pack is shown below.

The Felt Baseball Emblems ad has been replaced with a "New Big Size" ad statement by Topps.
Cards in the unspecified series packs could be cards from any of the print runs. They are most likely to contain cards made after the first print run (1-80). As of this time, I have not heard of a way to identify a card pack from the last print run, cards 311-407.
This page is not all inclusive of ways to tell series of the 1952 Topps Baseball
Cards.
As new ways are found out, they will be posted here.