9k Gold Chain Necklace Cable Link 40.6cm / 15.9 Vintage c1980.
The gold mark can be found to the bolt ring clasp, this simply reads '9k'. Good secure bolt ring clasp with a good spring.
Length 40.6 cm or 15.9 inches.
Width of chain 0.1 cm or 0.03 inches.
Weight 0.4 grams or 0.2 penny weight.