I was under the impression that the older floorplates were stamped with both "9mm" and "S&W", and later versions were simply "S&W".
These came on 2 double stack .40 magazines I recently picked up and are obvious replacements to work with the PGS adapters that somehow lost their plastic floorplates. They would work just fine but I did end up doing some switching around with some plastic spares in my parts stash to make things visually correct.
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