fairbairn–sykes fighting knife, is it legit?
My gut is telling me no, this is not legit. I know almost nothing about these however. Markings look good, scabbard looks good although possibly a late model NATO one. The problem in my mind is that there is no way one of this type would be dated 1940. Thinking this is a 3rd pattern which would be 1943 at the earliest. No other markings besides the date and broad arrow that I could find.
https://www.milsurps.com/images/impo.../KPBIhLp-1.jpg
https://www.milsurps.com/images/impo.../19H4X1C-1.jpg
https://www.milsurps.com/images/impo.../OgvUJkv-1.jpg
https://www.milsurps.com/images/impo.../iFd3g3R-1.jpg
https://www.milsurps.com/images/impo.../a4PzFEN-1.jpg
https://www.milsurps.com/images/impo.../DJXPoMc-1.jpg
https://www.milsurps.com/images/impo.../CtpN18L-1.jpg