Fairbairn Sykes F-S Fighting Knife Commemorative, very rare

Up for sale is a Fairbairn Sykes (F-S) Fighting knife. I am not a knife expert, but from my research and communications with someone familiar with these knives, I am still trying to narrow down who the maker of this knife is.This knife is in mint condition and features an engraved F-S fighting knife logo as well as an engraved signature on the blade. I did my best to take detailed pictures of the knife, but if you need any additional pictures or have questions feel free to contact me. !!