1819 Portugal John IV 80 Reis - Value?

This one sent me into the research books.

As I mentioned in an earlier post - a friend gave me about 10 pounds of world coins from his family vault.
I had to look through several catalogues to even find anything close.
Finally ID's the coin as:
Portugal: 1819 John IV 80 Reis coin.
It has a large number "80" and the date on it.

The catalogues only listed a "LXXX, No date."
So it was not even in the cataloges, but I have one. Good condition.

Any ideas on the value?

No pic - it's a very dark copper, 36mm - if someone really want to see, I'll try.
Thanks