Tom,
Not trying to make trouble, you have the examples at hand to examine. I think your conclusion about naked-eye examination and flat die stamping is perfectly correct.
It sounds like you are describing a unit mark which is stamped lentgthwise along the grip strap. The gun I examined Saturday was marked horizontally, on the grip strap's width. The mark was very fine, it was only apperent under some considerable magnification that the lines had the chacteristic "swirl" of a rotary tool. The magazine mark was made the same way.
--Dwight
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