Costa Rica 1947 15c on 30c Football Inverted Surcharge MNH. Scott C146.
$95.00
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Forged overprints appeared on the market soon after this stamp was circulated. Genuine examples have a 27mm overprint, forgeries measure 29mm. Sanabria states 150 inverted examples exist, SOCORICO quotes 200. Either way, scarce in genuine form.