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1990 Portugal 100 Escudos coin pendant necklace jewelry Pedro Nunes Portuguese mathematician cosmographer nautical sciences navigation cartography armillary sphere Alcácer do Sal Lisbon Porto Braga Faro Sintra Lagoa Vasco da Gama Quinas castles n003648

  • $16.99

Portugal 100 Escudos {1989-2001} 1S

front: Pedro Nunes (1502-1578), was a Portuguese mathematician, cosmographer, and professor, probably from a New Christian (of Jewish origin) family.

Considered one of the greatest mathematicians of his time, Nunes is best known for his contributions to the nautical sciences (navigation and cartography), which he approached, for the first time, in a mathematical way. He was the first to propose the idea of a loxodrome, and was the inventor of several measuring devices, including the nonius (from which Vernier scale was derived), named after his Latin surname.


back: Coat of arms of Portugal {5 Quinas}

After the official recognition of the Kingdom of Portugal as an independent country in 1143, 5 silver bezants were added to the blue cross of the shield, symbolising coins and the right of the monarch to issue currency.

Late explanations interpret them as the five wounds of Jesus Christ, also a traditional legend explains that these escutcheons represent the five moor kings defeated by King Afonso I of Portugal in the battle of Ourique.

From the fixation of the number of bezants in five, each of the escutcheons of the Portuguese shield became popularly referred as a quina (quincunx). By synecdoche, the term "Five Quinas" or simply the "Quinas" came to be used.

The golden castles surrounding the quoins supposedly represent the Moorish castles conquered by the Kingdom of Portugal during the Reconquista. Their origin is probably Castilian.


• quantity 1
• demonetized {no longer in circulation} polished Bi-metallic coin
Aluminium-bronze center in Copper-nickel ring
• diameter: 25.5 mm
• weight: 8.3 g

• 24" stainless steel ball chain {2.5mm thick, lightweight 5 g}
• no chain or cord
• 1-1/8" stainless steel keychain with 30 mm ring {see last photo}

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