Avon “MN” red rhinestones 20″ necklace oval round pear dangle vintage

Lovely necklace with prong-set and faceted red and dark red rhinestones in shapes oval and round, one pear-shaped rhinestone dangling front and center. Metal is a gunmetal brass tone. Overall length is 20″ including 3-1/2″ extender. Lobster claw clasp with small oval hangtag that says “Avon” on one side and “MN” on the other side. (Does anyone know what “MN” stands for?) Seller assumes it is vintage in age but does not know where it was made. Very good condition – nothing at all wrong with it – all rhinestones are present and accounted for.