Well here it is. Made in 1915 according to the hallmarks. MacKay and Chisholm. I do have a few questions for you experts. Is this a military or civilian sgian? The wood handle appears to be African Blackwood rather than Ebony (I have a lot of experience with both types of wood).

The carving and engraving is first rate.

The blade is a bit of a mystery. It has no markings whatsoever and is of an extremely hard metal. My boss and I attempted to buff out the scratches with a grinder/buffer and it didn't even phase the metal. What kind of metal is this? What would have been used in 1915? Perhaps the blade was already replaced (It seems to be original)?