Back in the Victorian era, people of well means had cutlery with Stag Antler handles like this and similar to this knives size and shape.  It's in excellent 120 year old condition. The blade actually some extremely faded lettering on it's side which, to the best of our ability to read it says; PROTOTYPE.  Is that a brand? We're certainly not sure but it does make this piece all the more intriguing.