As I had mentioned, a very noticible characteristis of the Type X/ Type II- A chains, is that the burnishing on these links didn't hold as well as what we call the Type II. Vic Diehl show this with his not only on this site, but on page 152 of Witty's Bible. I too agree with Fred (Frogprince) that the Type X / Type II-A chains are the earliest chain daggers produced. They have a vere heavy nickel content to them, are found only on early M36's, and are found far and few between in comparison to the Type II chain.
