Your quiver looks like a pre 1957 Blackhawk over the shoulder back quiver. Designed for up to a dozen arrows, it was really Bear's smallest leather hunting quiver. Similar design Bear quiver dates back into the 1930s.
Trim looks like nice elk hide, not sure what type of leather is on the body. Generally stamped with the Indian in the canoe on the back, but unusual leather may have negated stamping it.
Use a good grade of leather oil on it. If is is not cracked, looks like it will have a lot of useful life left in it.