Makers Mark On Pendant?

Is this a makers mark on the back of this pendant? It appears to read SOS. Does anyone know what this stands for? Thank you!

 

Oh boy.... The gate is open! Brass ring anyone?
I LOVE it though!
Australian fire opal?

 

It looks like it from here.....

 

Get closer.....

 

Haw haw haw !!!!!!!

I don't think that's a O lisa ???

 

Good question for I find nothing with SOS.
Hey!!! Does it look like it may be an ampersand?

 

Lisa, It looks to me like "585" (especially if you turn the pic. upside-down) ... have you tested this piece for gold content? 585 = 14K


P.S. .... It's a pretty little thing

 

OH!!!!!!

 

From what I know it's an antique piece, tests positive for 14k gold, natural pearls and Australian fire opal. It has a hole in the bottom where it appears something was hanging but the gold piece has broken. Let me post a pic of that. I am going to take a better look at the mark using the magnifier and see if it's possibly an "&". If I can get a better picture I will post. Thanks All!

 

Oh. Too bad. Something was clipped off.

 

Yes, I'm bummed about that. I bet it was something quite pretty.

 

After closer look the middle letter actually appears to be an 8. So I think you are right Quirkygirl; it appears to read "585". Thank you!!!

 

Thanks Quirkygirl! I think you are right. I looked at it closer and it appears to read "585". Thanks!!!

 

You're very welcome!

 

It looks like a type of slide - like one would find on a ladies long watch chain.

 

https://www.google.com/search?q=edw...0wOwvo#tbm=isch&q=edwardian+watch+slide+chain