I was told these are Herter's Universal Neck Sizing/Seating Dies & Collets. However i have no real idea how to use them compared to modern reloading dies.
I found a single reference from an old Herter's catalog but some of the die bodies seem a little different than others and i wondered if anyone could shed some light on how to use them or the differences between the two die body types? Or even the complete sets value?
Thank you
Dies Dies 2 Original Documentation 
