At one time Briley used "Super Turkey" on some of their chokes and of course they made a straight rifled turkey choke. The early models were also marked "lead only", were knurled and non-ported. I've not seen one with the turkey track but that does not mean they did not do that at one time. The rifling is shallow but is readily apparent when you look at it from the muzzle end.
The ones I've owned were made from "stainless" steel, probably 17-4 but I can't state that certainly. I still have a very early model "Mobil" choke that I used for several years with my first SBE. It was, and still is, a very good choke tube.
My guess is that is what you have.
Thanks,
Clark