Duke Hat

I have a Stetson Hat western 4X Beaver felt, and I try to find the name of the hat. On the side of the box, it reads like Duke-SD-ILL. There are no other markings inside the Stetson hat wait logo, 4x Beaver and size.

DUKE, named in honor of John Wayne, as he wore Stetsons legendary in many movies.

SD: no idea
ILL: Beaver Pelt

4x refers to the quality of the beaver pelt, with 4X being smoother.

SD could be suede, but the rest I do not know.

Stetson hats are supplied with a hot iron in the hat band, and an image inside of himself drinking his horse Mr. Stetson, a hat. I think the name of horses may be Duke, but others I have no idea.