Vintage Old Pawn / Bisbee Turquoise polished Nugget Necklace

This is an incredible, vintage Navajo / Native American jewelry piece; museum quality Bisbee turquoise nugget necklace.
This piece contains hard to find turquoise stones that appear to be old Bisbee Turquoise, probably circa 1950's or early 60's. The stones on this piece are absolutely phenomenal; they graduate in size towards the bottom. The smallest nugget is about 3/4" x 1/2" progressing up to the largest turquoise nugget, measuring around 1-1/8" X 1". Resting throughout the stones and on both ends are amazing white to brown shell heishi. This necklace contains wonderful light to medium blue turquoise nuggets with some red and copper colored veining / matrix; individual nuggets show multiple hues of blue that are criss crossed with deep red brown or shimmery copper deposits. The length of the necklace measures around 33.5". It's too heavy for my scale, so it's well over 3.5 ounces. 45 nuggets in total.
This is from my great-aunt's personal collection of Southwestern jewelry.