Vintage Mexico Sterling Silver Fancy Cut Black Onyx Pendant Drop Necklace

Statement vintage mid century Mexico sterling and onyx necklace - Signed with unidentified maker's mark: ACE - marked and tested 925 or sterling silver - 6 integral pendant links with scroll, twist and ball motif each set with a large fancy cut half cone gem of black onyx - necklace is marked: Hecho en Mexico Guadelajara 925 ACE - measures 16 inches long the drops are approximately 1 1/8 inches - weighs 31.5 grams - some tarnish as I found it - otherwise excellent.