Herb,
A good point, and thanks for bringing it up. I checked Still Axis Pistols p.125, according to this source the earliest byf 41 were issued with 122-marked extruded magazines, aluminum base serial-numbered to the gun. byf 41 were "generally" issued with fxo-marked mags, aluminum base serial-numbered; byf 42 were "generally" issued with the black plastic, unmarked base.
Still also notes the existence of these extruded mags with aluminum bases and only 42, S/42, or WaffenAmt eagle acceptance marks; he identifies these as arsenal replacement magazines.
In my conservative opinion the black plastic on a byf 42, or replacement-marked mags on byf 41 and 42, are 'authentic'; anything else either matches or doesn't.
--Dwight
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