Avon costume jewelry, founded in 1886 by D.H. McConnell Sr as a perfume company in California. The Avon line was added to the firm in 1920's and changed it's name in 1939 to Avon Products Inc. Their lines were sold through local representatives as it is today. They also sold giftware, jewelry, lingerie and cosmetics. The quality varies from cheaply made to good quality.
The initials on some Avon pieces (NR, BW, SP, SH, WN etc.) are NOT designer initials as many have attributed online, but an internal company code for jewelry in manufacturing
"The initials on some of our jewelry pieces are an internal company code identifying the vendor who has manufactured the jewelry for Avon.