Vintage gold-filled Opal and Seed Pearl oval slide charm necklace

Lovely vintage pendant/slide charm on a thin gold chain. Pendant measures 1/2" x 1/4", chain measures 16".  Very small circular opal in center, surrounded by etched floral pattern. Surrounded by 14 seed (baby) pearls. Slide charm means it has two holes, so this may have originally been part of an antique bracelet. But it has been in this form for at least 70 years. 

Back is flat gold oval, about 1/4" thick/depth wise.

Gorgeous vintage piece, very delicate. Amazing shape. See pics for details.