What does the 3rd symbol on this sword label mean? I have an century+ old sword which has this label:



A Chinese friend at work said she understood 光雲一刀 = "Light cloud [something] sword" but she couldn't figure out the third character, some kind of classifier, she thought maybe.

Can someone help me with that 3rd character please?
Thanks in advance.
my initial guess, the 3rd character is 刻 (u+523b)

http://humanum.arts.cuhk.edu.hk/Lexis/lexi-mf/search.php?word=刻

the seal script in the picture is slightly deviated from standard one.

anyway, i guess your sword is made by 光雲堂, a japanese carving knife manufacturer; maybe you can ask them directly :) 

http://kouundou.com/index.html