Cameo appearance

This is a piece of jewelry I am not planning on selling.

I'm pretty sure it came from my Mom's jewelry box.

I've tried to find similar pieces on Etsy and eBay

to learn more about when it was made

but haven't had much luck in that department.

That's where you come in.

Do you have any information to share?

Each picture is clickable for a better view.

Thanks.

NOTE: I remembered tonight there is a mark on the back --

"OBSTERLING." This is the maker's mark for Otsby & Barton,
est. in 1879 by Englehart C. Ostby and Nathan B. Barton,

makers of high end pieces during the Victorian and Deco Eras.

Ostby, originally from Norway, died in the Titanic disaster.