This Greek Pronoia (Social Welfare) semi-postal stamp features the classical architectural frame used on early Greek fiscal and charity issues, printed in green with a prominent blue cross at top. The bold blue overprint “Λ. 50” (50 lepta) updates the surcharge value, part of periodic revaluations applied during Greece’s turbulent interwar–WWII period. The inscription ΠΡΟΝΟΙΑ identifies it as a welfare-fund raising issue, where the postal fee included a mandatory charity contribution. Overprinted varieties from this era are widely studied for their typography, ink shades, and positional characteristics, making this a highly collectible example for specialists in Greek semi-postals and revenue-postal hybrids.