Brazil, 1835 AD., Pedro II, countermarked 40 Reis on older 80 Reis, KM 444.2.

Brazil, Pedro II (1831-89), countermarked 1835 AD. on a coin of the Bahia mint, 1829 AD.,
40 Reis on 80 Reis (38,5 mm / 26,88 g), copper, original coin mintage 3.993.000 ,
Obv.: IN + HOC + SIGNO + VINCES + , ("With this sign you will win") , crowned coat of arms in a 3/4 wreath.
Rev.: 40 // PET[RUS.] I. D. G. CONST. IM[P. ET. P]ERP. BRAS. DEF. / 1829 B , ("Pedro II, by the grace of God, Constitutional Emperor and Perpetual Defender of Brazil") , value number within wreath of floral decorations, circular countermark with new value 40 on old value 80 (still visible).
KM 444.2 (on KM 366.2) .

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."