Victorian. 18.5" long. Big (5/8") freestanding silver spring ring closure. I bet this is a (period appropriate) replacement for the original pendant/clasp combo, which was taken off and sold separately - no hallmarks remain because they were prob on that. Each link (1/2" wide) is formed with the "tooth" at the front and a plain bar back Squred off rings between. I will regret selling this. Someone get a big ass pendant on this! c. 1880.