So difficult to work out country / value

I have recently come across a whole load of coins which have been up in a family members loft for years - in there was this beauty. First looks at it made me think it was very valuable as it was in a decent condition and was the only coin in the box that had been wrapped in tissue. However I am very unsure as to what country it was actually minted in and what year - I was hoping one of you would be able to help . TIA

Matt

HERE IS START ...

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

Here's a more comprehensive guide to Maria Theresa thalers struck across the world since 1780;
http://www.theresia.name/en/

It already has a value on numista....

VARIANTS

https://en.numista.com/catalogue/pieces33437.html
https://en.numista.com/catalogue/pieces33436.html
https://en.numista.com/catalogue/pieces59987.html

For extra info, see this old video...

P.S. - these are old (keep in mind)

https://www.youtube.com/watch?v=CqNXaKJKyWs
https://www.youtube.com/watch?v=02PrUeu-13Y
https://www.youtube.com/watch?v=cnJAvqUKEvg
https://www.youtube.com/watch?v=G1OLO56sMY4
https://www.youtube.com/watch?v=-kTyHEyuTQU
https://www.youtube.com/watch?v=2nQzf1qalcg

Citação: "Numismatist uk"​It already has a value on numista....
​
​VARIANTS
​
​https://en.numista.com/catalogue/pieces33437.html
​https://en.numista.com/catalogue/pieces33436.html
​https://en.numista.com/catalogue/pieces59987.html
​

​I don't believe any of these variants listed are relevant to the coin posted above, though.

Probably 98% of the MTTs us Numista members own (and that exist in the world) are restrikes of some sort, produced from 1781 until the present; examples of this coin, including the 1780 X coin posted above. It has 12 NRI, whereas the three links there are all in the 90s NRI.

Citação: "CassTaylor"​

Citação: "Numismatist uk"​It already has a value on numista....
​​
​​VARIANTS
​​
​​https://en.numista.com/catalogue/pieces33437.html
​​https://en.numista.com/catalogue/pieces33436.html
​​https://en.numista.com/catalogue/pieces59987.html
​​

​​I don't believe any of these variants listed are relevant to the coin posted above, though.
​
​Probably 98% of the MTTs us Numista members own (and that exist in the world) are restrikes of some sort, produced from 1781 until the present; examples of this coin, including the 1780 X coin posted above. It has 12 NRI, whereas the three links there are all in the 90s NRI.

If you (pearcem1) are able to try to add it.​

Hafner 49-66. Your pictures are terrible though.

http://www.theresia.name/en/svariants.html Scroll down to the last section for S.F.