Austin,
I don't believe the stamping had to do with gauge. I believe it was different time periods of manufacture.
I have only 20 and 28 gauge guns so I can't speak to the other gauges. Some of my guns have no choke stamping, others have just one digit 1-4, and then some are in fractions, 0/4,- 4/4.
These are the only pictures that I have with me.
I am finishing the last weekend of turkey season, but will post photos when i return home.
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