St. Lawrence costume jewellery find

I rarely go to St. Lawrence market in Toronto, but yesterday I met an old university pal for brunch in the area, and ended up checking it out.

Natch, I looked for what is always my big weakness: costume jewellery.

This piece took the cake.

It fits high on the neck and the multiple chains fall on the side just as you see it here. There's even a double clasp to make the necklace more of a choker.

I tend to be drawn to 1970s stuff but I'm not sure I can place this era - any one out there want to hazard a guess?