Vintage Sterling Silver Eagle Bald Eagle Mother of Pearl Turquoise Enamel BB Ring

A very cool and interesting mens vintage sterling silver ring. The bald eagle is composed of mother of pearl for the face and tail, and what I believe to be enamel for the wings. A thin section of turquoise circles the ring. It is stamped "Sterling" and "BB" for the maker. I do not recall the makers name, but there is no doubt a lot of time and effort went into making this piece. It weighs 19.7 grams on my scale, is size 11 on my ring sizer, and is 28mm tall by 17mm wide at the turquoise ring.