Brazil
Republic "SANPEX" Countermarked 960 Reis 1956 XF, cf. KM-XC11.1 (undertype of KM368). 41mm. 26.39gm. With Type XI counterstamp upon a 960 Reis host of Pedro I displaying strong traces of the undertype-- a Bust 8 Reales of Charles IV.
https://coins.ha.com/itm/brazil/brazil-republic-sanpex-countermarked-960-reis-1956-xf-/a/61216-99200.s?type=CoinArchives61216
HID02906262019
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Estimate: 80-120 USD