Looks like it could possibly be an SOE - clandestine 'spy' dagger.
It's a bit large - letter opener ? Not familiar with
It's a wasted trip baby. Nobody said nothing about locking horns with no Tigers.
I'm Spartacus, not really i'm Paul!...
I have seen this marking before but I cannot recall where........
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Its British at a guess, it looks like it uses a unused 1888 or 1903 bayonet.
I think the reading of stamp will be the solution ?
I'd have to disagree, we Brits used the 1888 bayonet blade as a dagger even into WW2.