New to Broadhead Collecting! Can't identify these

[recurvgurl]

Hi everyone! This is my first post. Total newbie to collecting and Archery in general but love it. I came across these at a yard sale. I want to know can I use them or should I put them on a shelf?    

[Bob Gulliksen]

Looks like a Case Kiska

[recurvgurl]

I thought so too Bob! The pic I posted was too big here's another with the other two.  I also wondered why they aren't sharpened?
 

[Bob Gulliksen]

#1 Kibbe Big Game #2 Case Kiska #3 Case Konvertible

[bowhunterfrompast]

Considering that those heads were made in the late 1920's and early 1930's, I would not use them.

Nice find, a few great heads to start a collection.