sorry, I disagree on the magazine issue - sometimes some mags will be extra tight and others will work fine. It just depends on the frame.
I would agree that most mags will work fairly well, but I would not say they just work.
As far as I know, 1900's were acceptance marked and proofed, only ones without any markings would be the ones for the time frame of the tests (sn 6000-8000 approx)
Ed
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