G Date with DWM toggle - need help

[sthomp]

Klaus...yes, not much question about the grips...and the fakery of the mag. However, the numbers on the frame and barrel do match...both 6616. The problem is no suffix that is readable. Also, I don't detect any color difference between the barrel, receiver and frame. It has clearly been refinished and the barrel/receiver would certainly have been done together...not much chance of color difference.
Here's some new info: the tool that came in the pouch of the A. Fischer 1941 holster is marked "byf41" on the little vertical tab at the big end. I can't find any reference (STILL, Gortz & Sturgess etc) that document this kind of tool marking...is this yet another "boost"? (see pics below)