Portugal used to have its own currency for every colony. They'd nominally have the same value, but in practice they were exchanged at different values. They'd only abolish them and create a single currency in 1931. See: the .pdf in my post, it's in Portuguese though. If anyone is interested I'll translate some of it.
Related to this, I'll post about the greatest scam in Portuguese history.
Alves dos Reis was a university dropout who decided to move to Angola to make his fortune. He faked a university diploma from Oxford. He bought a large portion of Angolan Railway shares with a cheque that didn't have any credit to it and became wealthy. He then began forging US$ cheques to purchase more companies, he was arrested but he was released later, he was found to be the victim of a criminal conspiracy. Why would this wealthy man forge cheques?
He moved onto to his greatest scam:
He forged a contract from the Bank of Portugal authorizing him to print banknotes in order to develop Angola. He got it verified by a Portuguese bank notary, the British embassy, the French embassy and the German embassy.
He convinced several currency traders to join him on his shady plot to print currency, as they believed it was a shady plot started by the Bank of Portugal to print money under the table to issue a confidential loan that could have disastrous political consequences.
He convinced a Dutch bank note printer company to create notes for him, the dutch company told him that he should approach an old British company that had the plates used for Portuguese notes (Waterlow and Sons). Alves would eventually figure out the sequence of serial codes used in notes, but his first order contained some had already been issued. The company reached out to the Governor of the Bank of Portugal, but this letter never reached its destination. Reis convinced Waterlow and Sons that he could use them for colonial use exclusively, so it wouldn't be a problem.
Alves dos Reis got so many of these banknotes printed that there were almost as many fake notes as real ones in circulation.
>Waterlow and Sons Limited printed 200,000 banknotes of 500 Portuguese escudos (which was equivalent to 0.88% of Portugal’s nominal GDP at the time) with an image of Vasco da Gama, with the date of 17 November 1922, to a total face value of 100 million escudos.
Alves dos Reis used the profits of his scheme to attempt to purchase ownership of the bank so as to then retroactively make the order legitimate and his master plan complete.
By this point, the Portuguese government had realized there were a lot of fake banknotes in circulation, but they were near impossible to distinguish from the real ones. The level of intricacy of this scheme led them to believe it was the work of a foreign power (Germany).
They would only figure out that they were fake by randomly finding a couple of notes with duplicate numbers.
The trial would be highly polemical since the judges believed that this scam must have come from the higher ranks of the Bank of Portugal.
The government would then have to deal with a currency whose value nobody believed in, and three months later, the government got coup'd by the military. Thus began the period of military dictatorship.