75 Reis 1823 Goiás - Brazil

This is a very scarce coin. Coins with it's face value (75 Reis) were struck since the 1750's (at that time in silver) to facilitate the gold trade (1.200 Reis = 3.585 g (oitava)(gold) -/- 75 Reis = 1/16 x 1.200 Reis = 0,224g), but stopped being minted in 1760. In 1818 the 75 Reis were once again struck, but this time in copper and alongside the very odd 37,5 Reis. This was called "Vintem de ouro" (vintem is a way to name the 20 Reis coins, that had the same weight and size, de ouro could be translated to golden). Between 1818 and 1821 they were struck in Rio, Minas Gerais, Vila Rica and São João del Rey. After the independency in 1822 the 75 Reis were struck only in Goiás, while the 37 1/2 Reis were in Minas Gerais. What makes the imperial 75 Reis more interesting than the other "vintens de ouro" is that they were struck over earlier coins, there's even one over an imperial 40 Reis. This only shows how critical it was to the gold circulation.