Here is additional info I found on another site which I have copied and posted:
"I used to work for Duke in Woodinville, Washington. We sold 4 Savora bows: A top-of-the-line takedown recurve (the Premier).
An economical takedown recurve (the Express).
A one-piece version of the Premier.
A one-piece longbow.
The Premier had curved limb butts that fit into curved limb pockets on the riser (similar to a Cascade or Chek-mate takedown). The Express limbs bolted flat onto the riser back (similar to a Morrison, Robertson, and many others). Both featured brown glass. The riser on the Premier was a rosewood-colored dymondwood. The Express was a less-dense, lighter-colored, laminated material. The Premier was one heck of a bow. I didn't really care for the Express by comparison.
I hope others will correct me if I am wrong, but I think most of Duke's bow-making equipment was sold to Northwest Archery when he died. I think the longbow became the basis for laminated "Pacific Yew" longbows.
I've seen quite a lot of minor variations on the Premier and Express. Duke and his bowyers were forever tinkering and made all sorts of things in limited numbers... too many to describe them all."
As a side note, I have read that Bill Stewart of Yakima (now deceased) made some of the bows."