Luger with H&H barrel

[sparky]

Hi:

New to the board.

I have been introduced to a Luger with the following specs:

WWI manufacture, 1915 I think but not sure.
Six inch barrel with H&H stamped on the underside of the barrel.
Huge target sights.
Shoulder stock lug.

Can anyone tell me anything about this piece? Does the H&H stand for Holland and Holland? Is this a one-off, or were a bunch made up and for who and what? What would be its value? I may want to purchase it.

Thanks for your help guys.

Cheers,
Sparky