I asked Ron Flook about this knife because a similar appears in his excellent book on plate 156.

He answered:

 "Very difficult to know about these wood gripped knives with marked blades.  They could be post war but I belive they could well be late war production.   We do known from photographic eveidence that wood gripped knives were carried around the time of D-Day so it is possible that marked knives were made around this time, possibly even as private purchase.

 But like many thing we will never know for 100% sure."

A fellow collector bought this knife with provenance from a veteran.
He got this letter with this knife.

I have found two sheaths, beside the ususal FS scabbard, for this type of knife.
One from Sheffield England.

The other one from Canada or USA reminding me about the M6 scabbard.