Black Widow byf41

[breedlih]

I recently acquired a byf 41 Black Widow luger serial # 7996 (no prefix or suffix).All matching numbers except magazine which has an aluminum bottom and is stamped 9697, a waffenampt 83 and what looks like either a "U" or "N" in italics.The bakelite grips are definitely original.Any ideas as to value? Thanks in advance.