The Knife of Llawfrodedd the Horseman
This knife would serve 24 men - whatever the heck that means. Does it create food enough for 24, or is the ultimate Ginzu knife and slices 24 slices at once. Apparently there is some connection to Excalibur for this knife, but I cannot find out any more than that. Maybe they are cutlery cousins or something like that. The guy who drew the picture below (some chap named Vorp - poor fellow) calls it the Ornate Celtic Cheese Cutter.
There was a contest on the Concept Art web site that challenged artists to design the 13 treasures of Britain. You can see all the designs at:
I cannot find any more about the knife; however, there is more about this Llawfrodded guy. The guy is a Welsh hero. Not only did he own the knife, but he also had Cornillo, one of the Three Prominent Cows of the Island of Britain (say that three times fast). He is mention in the role call of heroes in a few texts dealing with King Arthur. Probably he is one of the Men of the North and lived in the sixth century.
Next... the Spork of the Lady of the Lake