Indonesia
Republic Specimen 50 Sen 1952 SP66 PCGS, KM9. Tied for the finest yet certified by either major grading service.
Ex. Kings Norton Mint Collection
https://coins.ha.com/itm/indonesia/indonesia-republic-specimen-50-sen-1952-sp66-pcgs-/a/3087-31194.s?type=CoinArchives3087
HID02906262019
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Estimate: 400-500 USD