Featured Putting this in JEWELRY cuz there's no specific coin forum, but wondering

if anyone can identify the coin from just the back.....it's a pin/brooch I've had for years & years, and don't think I posted it earlier! Thanks for any help you can offer.....obviously the back is silver, and the front won't be any help, but I'll post that too since it's nice and I LOVE it!!!!! What can be read says PATRON, then something ending in NG after the left side of the clasp, then 1783 X S.MARIA DEI and a B (I think) encircled at the bottom....DON'T know if there's anything under the right side of the pin! ANY help most appreciated...as ALWAYS!!! Thank you again!!!!
@daveydempsey ???

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https://en.ucoin.net/coin/hungary-1-thaler-1781-1785/?tid=88131
https://galeriasavaria.hu/en/termekek/reszletek/ekszer/5587430/Ezust-medal/

 

The enamelled Madonna is after Raphael's "Madonna della seggiola (or sedia)"

https://en.wikipedia.org/wiki/Madonna_della_Seggiola

 

Google translation of the text:

Around 1900, marked with the Budapest hallmark after 2016
1776 PATRONA HUNG.S.MARIA MATRER DEI silver coin "B" minted, with various engraved decorations on the obverse and painted enamel Mary with child,
25g
diameter: 4cm

 

AJ you are amazing.

 

So are you, pearls.

 

Think this is a typo on the part of the web page. Surely it's MATER DEI?

 

Yes, it is mater. It was a typo on the original Hungarian site.

They didn't know Raphael's painting either. If they did, they could have posted the title, instead of M(r)ater Dei.

 

Maria Theresa modeled for the back, looks like!

 

There is what is probably the medallist's mark at 6 o'clock on the un-enameled side. (I'm not sure which side is obverse & which is reverse.) Looks like maybe P.?

 

B ..maybe?

 

OH MY Goodness!!!!!!!!! Thank YOU SO MUCH @Kronos & @Any Jewelry!!!!!!!!! You have NO idea how long I've wondered what the other side was or looked like!!! Value as a coin I realize is gone, But I have NO INTENTION of ever selling it!!! Someday, it will be passed on to one of my nieces, but not until I'm gone!

THANK YOU~~~THANK YOU~~~THANK YOU ALL!
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AND I couldn't decide if that was a P or B either, so I went with 'B'!!