I have seen pics of the old leather top, with upper and lower spring arms, but none with the upper spring arm and lower bolt arm. However, Bear was always the contrarian, and stuff did not always appear in their catalogs. I am not surprised to find that Wade has one, and confirmed their existence.
I have not seen one in copies of old Bear Facts, Bear Tales, and Bear Big Sky newsletters from Bear Archery and in different books about Fred Bear.
However, I believe one of the earliest models produce and marketed had a solid back and lower arm, and first appeared in 1944. Later models with an double spring arm and "L" shaped upper and lower brackets (tape on model) were available in the mid-1950's.
Sometime around 1950 the popular leather top began to appear with the lower arm and wire frame. Double spring arms and "L" brackets followed. Several tape on models can be seen in Glenn St. Charles' book, "Bows on the Little Delta" (page 149 and 181).
Fred Bear tested equipment sometimes for several years before making it available to the public. I think the double spring arm on the 4-arrow quiver, was offered for a short run prior to the 8-arrow which appeared with a double spring arm, before the lower bolt arm model. Fred used the double spring arm 8-arrow quiver in 1960, and used his T/D in Africa in 1965. Both were offered several years later.
I believe this maybe why we do not see the model you ask about. Fred used the 4-arrow with the lower arm thru 1959.
I think it would be interesting to see pictures of the different models, and dates they were available.