Rhys,
Thats a nice one, is it a plaster filled grip? and what type is the blade tang?.
It is thought Holler used this crossguard twice during the period, the hand enhanced ones appearing prior to the standard Holler 3rd crossguard and then again later in the war, normally found with no enhancing and a standard round punched eye.
It is the first time I have seen what appears to be a later war construction ( base metal & grip ) with this level of enhancing.
Its a lovely looking dagger with outstanding Holler characteristics.