unknown coin

hello
what about this one?

4.5 g and 25 mm
thank you

The crown and the shield under it are visible.
They can give clues about the country.

May start with Poland, Austria, Spain, some german (too much work) that is why it is better to dig out some info from the crown.

Period most likely the 17 c. (16XX) as it looks but the 17XX as for the mass.

Looks like an "I" on the reverse, maybe that helps

How could this be Polish? It's a Portuguese copper reis, you can tell by the shield within the crowned globe

NICE KENNY!  
You are correct. PORTUGAL
It is a casted coin: "I½ Real" from Pedro Princeps (1667-1683).

https://en.numista.com/catalogue/pieces35282.html

It is 90% destroyed but we stil can see some parts of the legend

Hello
That seems to be, but mine is just a bit heavier.

Quote: kommodoreHello
That seems to be, but mine is just a bit heavier.

It is for sure from Pedro Princeps. The shield and the crown are from 1640 to 1678.
Therefore it could be from João IV but, in this case, the legend of the obverse was  REX XVII (18th king)
The 3 or 4 letters we can see in the obverse corresponds to to the legends of Pedro Princeps.
The wheigt is correct since the variation is  from 3,4 to 5,7 g.
There was also the possibility that the coin was from Afonso VI (1656-1667)but, in all my life, I have only see one coin from this king and the legend does not correspond to yours.

Thank you very much for the info

Just for your records, these are the coins from my collection:

Looks like the task was solved.

Too many details are left to find the solution.

Once in my practice a roman denarius was attributed correctly just with one letter in inscription visible.