Victorian era, 9k rose gold twist chain with hallmarks on every link and makers mark.
Hallmark CDB for Charles Daniel Broughton, with date mark 1901-1907. Both dog clips and t bar have this mark. Every link marked 9 375. Measures 15.5 inches wearable length. Graduated links are 7.6mm wide at widest and 6mm at skinniest. Weight is 36.77 grams.