US 1918
This is a remake of the American Military trench knife handle it is cast in brass quite heavy too as the palm handle is quite thick. It is really nice and comfortable the holes are nice and big and not too far spread apart, it has also got spikes on the end of each finger hole.
Someone has started reproducing the hole trench knife now and are sold in the US for around $20 but at a close look the handle doesn't look as well cast as this one. I think originally the US 1918 was made in France too.
You still see a lot of original US 1918 trench knives for sale too on auction sites but expect to pay a few hundred dollars if you want an original.