Is there any extinct coins?

Is there any extinct coins that we know about? My country finland has (probably) none, unless some turku coins have been melted/destroyed completely.

I've read about some coins being described but none ever being found, I can't name any off the top of my head, but with banknotes this is actually quite common.

In the HRE there were some years coins were minted and smelted to make new ones (with less silver content of course) up to twice a year. I can imagine that a number of coins with small mintages and not a far reach (many local coins didn't travel further than 50km) didn' survive to even be recorded.

Would withdrawn coinage be considered extinct?

Citeer: "Oklahoman"​Would withdrawn coinage be considered extinct?

If they still exist today then they can't be considered extinct, otherwise all demonetised coins could qualify. ​

I believe that I read it about this one: https://en.numista.com/catalogue/pieces87581.html

Reportedly none was ever found, only thing out there is a contemporary drawing.

There is no note in KM nor Fedorov catalogue.

Actually Finland possibly has extinct coins. https://en.numista.com/catalogue/pieces91953.html
This coin was found in the Hämeenlinna castle. Agricola, the person who translated the bible into Finnish and finally created the language, notes in the bible that the roman coins were worth as much as "5 6 penningars" OR "30 little pennings" which makes me wonder if a "1 penning" coin has existed. We never know about these, the unfound coins could be in someones closet, a medieval castles ruins, or just somewhere under the dirt.

Here for the City of Aachen, all recorded drawings of coin where none have ever been found to date https://www.aachen-muenzen.com/typen-aachener-münzen/verschollene-münzen/
it happens quite regularly that new coins or varieties are being discovered.