There have been 'suggestions' over the years that a 'magazine variation' manual is needed.
I have no knowledge/feeling on the 'whens' and the 'which models'. That info can only be accumulated from pictures of 'safe queens' that are still with their original factory issued magazines.
My 'collection' is to have one of every possible variety as a 'reference', but that does not mean that I know date and model of issue.
That steel follower ( X style) is actually the 2nd version, the original version (as I learned recently from another member) was flat steel. And rare.
Model 52 mags will not be included in my 'collection'.
My collection started by acquiring mags for my pistols.
A 1006 from long ago, no I don't sell any of my 10mm mags.
59 series started when I had a 5946, all I have now is a 915 with intentions to get a 5906 and 5946.
39 series for my 3913NL and 3953, eventually want a 3906.
40S&W for my 4053, eventually want a 4006 or some variation.
45s', just to collect the mags for reference, don't want a 45
356TSW, just to collect the mags for reference, I have no desire for a pistol.
69 series, just to collect. I had a 6906 and 6946 but prefer the slimmer grip area of the 3913/3953.
CSs' just to collect the mags.