Depicts an armored 1/2 length figure of Pedro Nunes holding globe facing left. The engraver's name and abbreviation of the Portuguese Mint and Official Printing Office (INCM) below.

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

Nunes, considered to be one of the greatest mathematicians of his time, is best known for his contributions in 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 also the inventor of several measuring devices, including the nonius (from which Vernier scale was derived), named after his Latin surname.

Coat of arms of Portugal above value in a circle, surrounded by the country name and date below.

The coat of arms of Portugal is popularly referred as the Cinco Quinas (Five Quinas) or simply the Quinas (a quina being each of the five escutcheons in form of a cross with five bezants of the Portuguese shield). In the late 14th century, the number of bezants was fixed in five. Late explanations interpret them as the five wounds of Jesus Christ. The shield resting in front is composed of seven golden castles, which represent the Moorish castles conquered during the Reconquista. Behind the shield is an armillary sphere, which was a navigational instrument, and symbolizes Portugal's importance during the Age of Discovery.

KM#645.1 - 5 reeded parts
KM#645.2 - 6 reeded parts