Vintage Italian solid 18k yellow gold omega link collar necklace that attaches with a push clasp and has one figure eight safety lock.?

Please note that the heart pendant shown with this necklace is sold separately.

ID#: NEC432

Metal: 18k yellow gold?

Length: 16 inches?

Width: 5.87 mm

Weight: 40.89g

Markings: '750' (18k gold purity), '289 VI'?