Coins of Angola, by L. Rebelo de Sousa (Banco de Angola, Luanda, 1966), is a reference work on Angolan coinage, covering coins from the colonial period up to the mid-20th century.

The book details silver, and copper coins, including of republic portuguese issues, analyzing types, mints, legends, iconography, and historical context. Essential for collectors and researchers of Angolan and Portuguese colonial numismatics.

Portugal, coin of 50 Centavos 1966 Alpaca of the Portuguese Republic, or $50 Centavos 1966, belongs to the third series of 50 centavos coins of the Portuguese Republic, coins were minted in the Alpaca alloy (Cu 610 - Zn 200 - Ni 190) with dates from 1927 to 1968, created by Decree 13797 of June 21, 1927, their issuance ceased under the terms of Decree-Law 49167 of August 4, 1969, they were withdrawn from circulation under the terms of Decree-Law 267/81 of September 15, 1981. Total issue in the various dates minted between 1927 and 1968 was 130,000,000.

Portugal, silver coin of Cruzado Novo 1811 D. João Prince Regent, silver coin of 480 Reis year 1811 of the reign of D. João Prince Regent, medium crown variant of 33 pearls, 3 pearls in the central arch, 7 pearls in the front internal arches, 5 pearls at the beginning of the external arches and 3 pearls inside them, 1-point diamond diadem, in the caption the letter "S" without serifs, on the reverse quatrefoils cantonating the cross of the Order of Christ with the petals closed, cross of the Order of Christ ✠ 21 mm with wide ends ◁⭥ 13 mm, in the caption the letter "S" without serifs, World Coins Portugal KM#331. Coin minted during the reign of D. João Prince Regent (1799-1816), born in Queluz on May 13, 1767, son of D. Maria I and D. Pedro III. Due to the illness of the Queen Mother, Prince D. João took on the responsibility of government from 10 February 1792, assuming it definitively as Prince Regent from 15 July 1799, until the death of his mother. 

Angola, bronze coin of 1 Escudo 1974 Bronze coin with axis almost medal alignment, moved between 10:00 and 11:00 Hours i.e. 310º, "very rare", (the 1$00 Escudo 1974 Angola coin only appears classified in Alberto Gomes with the Oblique Axis variant "8h"), this variant with an axis almost medal alignment, does not appear classified in any catalogue. (The normal imaginary minting axis of this coin is horizontal (↑↓), however, due to human error in assembling the dies, that is, the incorrect placement of the dies in the press, there were coins that were minted with deviated axes, this being one of those errors in this case almost a Vertical Axis (↓↓) "medal alignment"