Help me identify this hallmark

I was going through some stuff and found a necklace that belonged to my grandma. Just wondering about the maker. I did try to look for clues but couldn't find anything as difficult to deciper. All hints much appreciated

 

Would/could you post a photograph of the entire necklace, please? And give us an idea of era.

Debora

 

Engel Brothers?
https://www.langantiques.com/university/mark/engel-brothers/

 

It is a maker's mark, not a hallmark.
Hallmarks can only be punched by official assayers. Not every country uses a system of fineness guarantee and assayers, so not every country has hallmarks. The US is one of those countries that doesn't have official fineness control and assayers, so it doesn't have hallmarks.

 

Thank you so much