NOTE: THIS ARTICLE HAS BEEN REVISED AND UPDATED.
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As of August 21, 2022, this article was revised and updated in light of new information reported on 8/20/2022.  The major change focuses on one of the two Pitman pressing variants, "Pitman pressing ー Variant Two (listed below as no. 9)," which turned out to be a product of Peter Pan Records' pressing plant in Lakewood, New Jersey. Accordingly, it was renamed "Lakewood pressing" (or could be alternatively called "Pete pressing").
 
- As of February 23, 2023, this article was corrected in response to the comment by wbhist (see here), who provided an accurate size of the stamper ring for Lakewood/Pete pressings as well as the three Columbia pressings (i.e., Pitman, Santa Maria, and Terre Haute). Although this post originally reported that these pressings shared the same diameter size, as in the comment, I confirmed that Pete's diameter [2.75" (69.9 mm)] is slightly longer (by approximately 1 mm) than the others [2.703125" (68.7 mm)]. Moreover, the ring size of the Hauppauge/Keel and Holbrook/Goldisc pressings was also found to be a bit more than 69 mm and, thus, the same as the Lakewood pressings (2.75"). Accordingly, all the relevant information has been corrected.

