I can not say for certain but it is probably not the original and its set up is either some form of battlefield replacement, mission specific or personal carry preference. The blade and edge itself are in excellent shape and still sharp with some wear. The overall construction is excellent.
A very rare piece, desirable for WW2. And special forces related militaria.
Length Dagger 7.5 CM. Contact me for further assistance. The item "Rare WW2 Original SOE Agents Thumb Dagger" is in sale since Monday, May 8, 2017.
This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\Great Britain\Edged Weapons". The seller is "0mat10" and is located in Malta.This item can be shipped worldwide.