This is the classic 4 fillér Harvesters definitive, originally issued in blue, and later overprinted in red during the short-lived Hungarian Soviet Republic (Magyar Tanácsköztársaság) in 1919. The bold political overprint transforms a common definitive into a striking historical artifact from the revolution era. These overprints exist with numerous settings, types, and shades, making them a rich field for specialist study. A fine example for collectors of Hungarian overprints, provisional issues, and 1919 revolutionary postal history.