Simple, textural rope chain with a slim barrel clasp. 
This antique example dates to the early 20th century, and is really nicely made. 
Stamped and tested as 15ct gold 
Weight approx 7.93g 
Width approx 2.5mm
Length approx 18 inches 
Very good antique condition  - there is one tiny historical repair, but there are no solid spots which we often see in these.