Hey ramon: It appears like yours is the copper-nickel clad copper version as you said, no LEY marking the fineness of silver anywhere. Krause catalog mentions a mintage of 4,035 for the matte strike issues so pretty scarce type coin.
In Krauss catalog page 1603 it says exactly the information you provided but if you check the coin it has inscription: Ley 0.500 not in blank as the one we are providing.
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