Nacre brooch, gold. Does E stand for electroplated?

I broke my no buying until February rule and purchased three lots, so expect some posts next week.

Until then, just spotted this brooch on eBay. It's listed as nacre 19th century, but nothing else. It's clearly marked on the back, but I'm guessing it's plated? Does E stand for electroplated or something?

Thanks all!
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Gold Filled. Assuming based on the GF at the 6 o'clock position.

 

oh that's an F! I was thinking it was an E haha. Thanks!

 

The scrimshaw looks like it is done on ivory, not MOP.

 

Whole mark is probably 1-20-12K GF.

 

Right? That's what I was thinking. I didn't think it was iridescent enough.

 

Agree with gold-filled.
I see:
(triangle) 1-20 12K GF
The 1-20 is usually written 1/20.
This means that 1/20 of the metal weight of the item consists of 12K Gold.

(EDIT: Sniped by Bronwen!)

 

Fantastic, thanks for the breakdown! Very helpful all of you.

 

What points to that? It actually looks like some kind of plastic to me.

 

The hinge & clasp do not appear to be replacements & are from well into the 20th century. Suppose the little scrimshaw plaque itself could be earlier, but 19th century nacre is seller ignorance or a way to get it sold.

 

Could just be my aged eyes, but, especially in the unetched area between 1 & 3 o'clock, I think I see the little wriggly lines one sees in some sections of elephant ivory. Does not show the characteristics of walrus ivory. I don't know if whale can look like this.

Think the scrimshaw is signed with an F at 3 o'clock.

 

I see.
I took that as waviness in the plastic mix/molding.

 

I can't tell what material that is...and not sure if that F....is not a 7 ....

 

These were dead common during parts of the 60s and 70s. Some had real ivory decorations and some were molded plastic. This looks like the latter to me. Tons were sold in seaside souvenir shops, etc.

 

Rip.

Great to learn, thank you all! I did think ivory at first but figured as Bluumz did that it was plastic. Wasn't sure though! I thought perhaps nacre was the seller trying to get under the radar a little, but if its plastic probably not haha.

I will say that crack does look non plasticy and older, but with only these photos to go on its really hard to say for certain! I think my 10e will stay in my wallet...for now at least.