Dates to the Art Deco era, circa 1925.
Crafted in solid 14K white and yellow gold, and hallmarked as such upon the chain, as well as upon the spring ring. This piece does bear a maker's mark that I am unable to identify unfortunately.
The chain has alternating etched geometric white gold links and interlocking gold links, and is quite ornate. It measures 2.5 mm (0.10") from edge to edge. It would make an incredible necklace, and with it's ample length of 17 & 1/4" from end to end, it's certainly long enough.
The spring ring appears to be original, however the watch clasp is a replacement and is 10K (hallmarked). This piece weighs a very solid 8.6 grams.
Condition is very good, with no damages noted. As stated above, the watch clasp is a replacement.