Cordelia Pendant On Chain Large Star 1960s Vintage

This is a gorgeous piece - Cordelia design. The markings on the back are A/686/51 , pattern number, not the word Monet, but it is an earlier piece some were not signed. I love the chain design too, double loop. The item is in good condition but had signs of age as expected please study photos. The star pendant measures approx 7cm in diameter. Thanks for looking:-)