Thanks David and Nathaniel. I had a fancy ivory handle dha but I find this one more intriguing. This link to a to a tsuba sword guard inspired by a motor cycle disc brake is interesting. I wonder if the tsuba psycho babble in the link in the thread has any relevance. Personally I think the wheel hub was chosen out of practicality. If it was not that old when constructed it would have been really nice shiny hard and good looking. As Hercules started production in 1910 it could well be earlier than ww2.
http://www.vikingsword.com/vb/showth...ght=disc+brake
Psycho babble-
http://www.arscives.com/bladesign/ra...numerology.htm