Brazil, 1835 AD., Pedro II, countermarked 20 Réis on older 40 Réis of the Rio de Janeiro mint, KM 436.1.

Brazil, Pedro II (1831-89), countermarked 1835 AD. on a coin of the Rio de Janeiro mint, 1828 AD.,
20 Réis on 40 Réis (ø 36 mm / 12,23 g), copper, 14,34 g. theor. mint weight, original coin mintage ? , axes medal alignment ↑↑ (0°), plain edge,
Obv.: I[N + HOC + SIGNO + VINCES +] , ("With this sign you will win") , crowned coat of arms in a 3/4 wreath.
Rev.: 20 // [PETRUS. I. D. G. CONST. IMP. ET. PERP. BRA]S. DEF. / 1828 R , ("Pedro I, by the grace of God, Constitutional Emperor and Perpetual Defender of Brazil") , value number within wreath of floral decorations, circular countermark with new value 20 on old value 40.
KM 436.1 (on KM 363.1) .

Year / Mint Mark / Details
1823 R KM#436.1
1824 B KM#436.2
1824 R KM#436.1
1825 B KM#436.2
1825 R KM#436.1
1826 R KM#436.1
1827 B KM#436.2
1827 R KM#436.1
1828 B KM#436.2
1828 R KM#436.1
1829 B KM#436.2
1829 R KM#436.1
1830 B KM#436.2
1830 R KM#436.1
1831 R KM#436.1

KM: "In order to prevent chaotic conditions resulting from local and private countermarking, the government passed Law#54 of 6 October 1835 ordering all coppers countermarked according to the following standards:
2 oitavos = 7.18 g = 10 Reis
4 Oitavos = 14.34 g = 20 Reis
8 Oitavos = 28,69 g = 40 Reis
The countermarks consist of neat numerals within a circle, having a plain or shaded field."