Early century Sterling 925 hand carved bone Octangular Toggle necklace 45" GS559

Early century Sterling 925 hand-carved bone Octangular Toggle necklace 
Incredibly, the links are carved in one piece of material, and each link interlocks with the front and back link
The link is octagonal-shaped, and it measures 16.5 mm x 8.0mm
Sterling silver Toggle clasp
45.0 inches in length, 24.6 grams.
Keepsake necklace from a generation.