Sterling silver 5 strand chain necklace with sterling stations and lapis cabochons

5 strand sterling silver square chain choker. Unusual screw pin clasp. The chain strands are continuous and thread through the stations like sliders, but they are stationary. The stations are stamped with design on both the outside and inside, and have small lapis cabochons. Two side stations have 3 sections each and the center has 9 sections. The hallmark is virtually undecipherable but starts with an Omega symbol. Possibly an H after that and then a couple numbers 5 & ? Overall length 17"