I recently bought these on sale. I've read their names so many times on here, I had to get them. There are 3 volumes.
http://www.tandyleat.../61941-400.aspx
I haven't finished browsing the first one yet there is sooo much info and detail.
Your pic is a bit large, which makes it near impossible to get a good look at your sheath, however from what I can see it looks really nice.