|L: Ballock Dagger|
Dig rules don't allow a published image (yet) but here's a photo that will give you a general idea. What we found was similar to the knife on the left, except that the tip of the blade is missing, and the rest is in rough shape, as in very, very dirty.
Give it some respect though, it has been buried for over three centuries.
Source: Wikimedia Commons by gammaflightleader