If it is a legit Trail Master it will be a core of VG-1 with 400 series stainless sides.
They use Aus8 in many of their blades, but nothing that CS makes as San Mai III will be Aus8.
I had one I used for about a decade before I sold it.
Good stuff, but I wish they would offer handle options.
For the price of a San Mai, I would steer you toward a few other makers. Swamprat, Scrapyard, Busse.
You can get a Busse Basic for the price of the Trailmaster, and get a vastly superior warranty. Swamprat and Scrapyard too (all same "Family" of knives). Options for Resiprine C handles (MY favorite "soft" handle material). I find it more durable. Scrapyard has models that are fantastic for much less than the San Mai CS. Again, much better warranty.
Another thing to think about, is that in that price range, you are getting into custom chopper category cash. There are often makers selling legit, lovely choppers in that price range.
