value of vintage miriam haskell piece

by Kim Grant
(Fredericton N.B.,Canada)

I have a vintage necklace, with an oval shape attachment plaque that says miriam haskell, it is a rope like necklace with brown and beige stripes big gold beads small gold beads and brown beads,attached to a clasp that also says miriam haskell and on other side patent 3427691,

could you give me idea of the date and value, thanks Kim,

it's about 11 inches long can send picture threw g mail,