Thanks Wolviex, that just about nails it for me. This last dagger you have presented shows tha tfigurative daggers were being made at the time that illustrated literary themes. probably the creator of Spirals dagger found the title "Hunchback of Notre Dame" a bit to long to place on the blade.
I would only disagree with you that the images on all these other daggers are "evil" in nature. Death is a fact of life and i see nothing evil about images of skulls or skeletal forms. Snakes i have always seen as a postive symbol as they are in most cultures around the world. Owls we have discussed. Images of winged and/or horned demons can be seen in many different ways. The images of Pan and the Green Man were turned into images of the Devil by the church. Very early images of some angels are also horned. The horn is generally seen as a sign of power. Jews blow the shofar. Horn is highly prized by many cultures for a reason. My point is that evil is really in the eyes of the beholder here. Spiral wants to see satanists everywhere. It makes this dagger more valuable to him to think it was once owned by one. Frankly i find it to be very interesting regardless.
There are certainly other daggers shown in this thread that are much more obviously occult. But an assumption that they are therefore "satanic" in intent can only be made by those who lack a deeper understanding of occult matters. Occult matters are by their very nature hidden and often dark, in that they deal with a side of nature that is not usually embraced by the general public. People tend to fear what they don't understand. That doesn't necesarily make it evil.
Wolviex supports my thought that these occult daggers were most probably meant for show, or in some cases for the use of tracing sigils as a symbolic weapon of air in lodge style ceremonial magick. I seriously doubt they were ever employed as a means of sacrifice, animal or otherwise.