The Mysterious White 25 Centavos

I have recently acquired a collection of unusual errors composing of a series of odd twenty-five centavo coins. Instead of the usual golden yellowish texture, these coins are white metallic textured. I though first that these coins were intentionally dipped into zinc thus making the white appearance but my assumption was wrong, these coins were actually white plated coins in mint condition. The Bangko Sentral Ng Pilipinas could not explained how did this happen but after scrutiny these appears to be coins struck on foreign planchets or possibly planchets intended for another denomination or old stock planchets. The one dating 2001 looks like...

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