Opal Slide Chain - Gold Filled - Antique

Fabulous antique Victorian Opal slide chain in gold filled metal.  Opal is set in a gypsy star setting.  There is a small line running through base of Opal if you view under magnification.  Hard to notice otherwise.  Gold metal on chain darkened with age.  Chain is a bit prone to kinking but they so straighten out.  Approx 50 inches.  Has stationary functioning dog clasp.  There is a maker’s mark on dog clasp but hard to make out.