The Badger Attack is 'Busse' but very expensive.. It is INFI which is superb carbon tool steel that doesn't rust! A lot of guys here rave about 'Ranger' knives, a Guy called Justin (Gingritch or something similar) makes them. I don't know much more than that.. sorry!
Patti said a while ago the S6 would return, but no timing was ever given.
It is almost rust proof...they are very rust resistant, but I have had light....very light...rust on one of mine.