Issued by Deutsche Bundespost in 1990, this striking commemorative stamp celebrates the centenary of May Day — International Workers’ Day. The minimalist design, dominated by bold red industrial shapes, symbolizes labor and solidarity, with the large “1. Mai” (1st May) marking the date traditionally associated with workers’ rights demonstrations. The geometric saw-tooth pattern evokes factories and the industrial backbone of labor movements. This 100 Pfennig issue stands as a modernist tribute to a century of social progress and unity among workers.