Hi. It seems to be a portuguese "ceitil", perhaps times Alfonso V (1438-1481). This type of coin was struck until 1578 (Sebastian I of Portugal).
When Enrique IV of Castille died he (Alfonso V) married with his daughter Juana of Castilla in 1475 and so he was proclaimed king of Castille but at the same time Isabella of Castille (married with Fernando of Aragon) was proclaimed queen of Castille ... the war was short and finally Alfonso gave up his claim and Isabella and Fernando ( the catholic kings) continued reigning in Castille.
Very nice coin
When Enrique IV of Castille died he (Alfonso V) married with his daughter Juana of Castilla in 1475 and so he was proclaimed king of Castille but at the same time Isabella of Castille (married with Fernando of Aragon) was proclaimed queen of Castille ... the war was short and finally Alfonso gave up his claim and Isabella and Fernando ( the catholic kings) continued reigning in Castille.
Very nice coin




















