Guatemala
Republic Reverse Die Hub for 1/2 Real 18___ (1862-1865) AU (Rust), cf. KM138 (for type). 25x41mm. 163.71gm. An intriguing piece of the minting process, likely representing a sort of master hub used to produce the final dies. Interestingly the last two digits of the date have not been engraved, allowing for adjustment of the year on the final die.
https://coins.ha.com/itm/guatemala/guatemala-republic-reverse-die-hub-for-1-2-real-18-1862-1865-au-rust-/a/3088-34884.s?type=CoinArchives3088
HID02906262019
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Estimate: 500-1000 USD