Art Deco Sterling Silver "Arrowhead" Necklace

This necklace is made of links of an iconic art deco form of the triangle or arrowhead. They are quite detailed front and back. There is no hallmark but the bracelet is marked STG925. The necklace is quite heavy, as each of the triangle links is quite substantial, and the length is 15 inches not counting the spring clasp. Since it does not have a hallmark - I am wondering if this is a more modern piece done in art deco style - what do you think? The last pic is the back of the links - but there is a bit of an optical illusion. The front of the links are convex and the back are concave. They look like little paper airplanes but are quite thick.