Hello again, just got this from my grandad inlaw. http://instagram.com/p/Vv5BGNOZtE/

Two razors are Halfmann Special by Solingen. The other one is Le Kiki... The brush is badger... The stone is marble (I think).

1) can I do something about the rust?
2) can I do something about the one razor with the crumbled cutting edge?
3) what's the use of the marble stone?

Please help me, cause I love the two Halfmanns.