What is this?

Can anybody tell me what I have here?
I’ve seen this version of a cross before on coinage but the flip side stumps me. Any ideas?
If so, how do I tell if it’s real?
Yorkshireman,Obsessed collector of round, metallic pieces of history.Hunting for Latin American colonial portraits plus cool US & British coins.
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Comments
Gold cob (2E?) mounted in a pendant. Very common to do with shipwreck pieces as there wasn't enough demand otherwise.
Maybe a cob expert can ID it better.
Its highest and best use is probably that pendant, so best to leave it alone.
Edited to add: If I had to guess, I'd say it's real.
Thanks.
I thought it looked like a cob, but the orientation of the shield threw me. I’ve only seen the photo so far.
Jeweler friend scanned it as 75% gold so it must be fake or his machine is off .
Wear wouldn’t take a .925 coin down to .75….
Where are you getting 92.5% ?
The coat-of-arms on the reverse looks like Charles II.
https://historicalcoin.com/spanish-gold-2-escudos-gold-cob
Weren’t they .925% gold?
I believe 0.9167 (aka 22K) purity.
No idea about why the discrepancy though.
I'm stating the obvious, but did you check with a magnet?
Did the jeweler check the purity of the mounting? Is the mounting marked?
EDITED TO ADD: I can see the mounting being 0.75 (18K) gold. Could he have somehow checked that?