Vintage Enamel Pendant Necklace Stamped NRQ (Avon?)

A beautiful enamel pendant hangs from an antique brass-colored asymmetrical chain. Pendant is stamped "NRQ" on back, which I believe is an Avon marking. Chain measures approximately 18 inches in length and has a lobster clasp. Pendant measures approximately 1 and 1/8 inches by 1 and 3/4 inches. I ship quickly and with care!