Black Widow is a term coined for a marketing tool.
Years ago, the BYF 41s with darker finish, black grips and black mag bottoms were distained by collectors.
"Real collectors" wanted nice navys, DWMs, etc.
Unit marks, double dates, and Nazi pieces were of lesser consideration.
The BYF 41s were the bottom of the list.
I turned up my nose at several "in the day."
A few years ago the term " Black Widow" was coined by a certain dealer and the race was on.
A similar phenomenon can be seen with the recent popularity of "Last Ditch" really crude Japanese rifles.
There is a fine line between a hobby and a mental illness.