This Greek commemorative stamp was originally issued for the 1937 Thessaloniki International Fair and depicts St. Demetrios on horseback, a revered protector-saint of the city. Printed in a rich brown tone, the original face value of 20 Lepta is boldly overprinted with a green “ΔΡ. 1” (1 Drachma) surcharge—one of several provisional revaluations applied during the period. The fine engraved detail of the mounted saint, combined with the clean, centered surcharge, makes this a sought-after item for collectors specializing in Greek provisional overprints, Macedonian regional issues, or exhibition-themed philately.