I'm sorry I've kept you waiting! ;)
http://www.mediafire.com/download/xcqfblw9c5bccaq/seikishin.jpg
#1,2,3
These words mean the Three Treasures (traditional Chinese medicine).
Please refer to the Wikipedia for more details.
http://en.wikipedia.org/wiki/Neidan
Meaning of each kanji in Japanese
#1. 精 (sei - "energy, vigor, vitality, etc.")
#2. 気 (ki - "feeling, mind, disposition, etc.")
#3. 神 (shin - "God, and others.")
#4. 鉄 (tetsu - "iron")
#5. 龍 (ryu - "dragon")
#6. 土 (tsuchi, do - "earth, soil, etc.")
It's difficult for me to read them because of these written in sousho(Japanese cursive).
Not for sure, I suppose this is a craftsman's name or a shops name.
I would be happy if your friend still plays Kendo.
Because I used to play it when I was a junior high school student.
Thank you for reading my poor English. :-)