Watch List notes:

Portugal Portuguese Joao III (1521-1557) Friedberg 25, coins of this denomination almost never encountered, and then it is usually the Friedberg 24 type, this rarer still, weight 34.32 grammes, approaching Fine with a small plug on the reverse, internet searches show very little information about these types, also we note there was no example in the Eliasberg Collection, most major collections are missing this famed European rarity

Estimate: 11000-14000 GBP