Lovely, slinky double row chain, designed as a rectangular snake like link that is extremely tactile.
 
Really more of a collar, the two lengths of chain each terminate into the silver trefoil clasps from which silver rings fasten at the nape of the neck with a small silver bolt.
 
Great for layering, and if you are creative you can attach bolts and dog clips from which to hang pendants and charms.
 
weighs - 53.09g
wearable length - 16.5" 
chains - 3.6mm wide
English circa 1940
Excellent condition