Antique Victorian Era Gold Filled Book Chain Y Drop tassels Necklace with CAMEO

Incredible vintage book chain style gold filled necklace with a carved cameo bust. Clasp clips on side of tassel pendant in a somewhat hidden manner. Very old estate piece that I believe is late 19th century but could be early 20th. I included many pics that illustrate various lengths in different ways. The length from the chain near the clasp to the top of the cameo housing is a tad under 17. I find no damage and its well made at over 21 grams.