BYF is the concealment code for Mauser-Werke. Same as an S/42 or 42 code or a Mauser "Banner". All the guns came off the same assembly line and went through the same blueing tanks. They went from the time consuming, labor intensive "rust blue" to the hot tank salt bath blueing in 1937. There are slight variations in color, but nothing specific to a BYF 42 gun, other than the black bakelite grips, which came about in '41 and continued into '42, although they were not used all the time. Many guns of those years were supplied with walnut or beech grips. "Black Widow" is a made up term, much like "assault rifle".
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