Detail photo of a stamp. The stamp shows a danger sign "Upward gradient" with the German inscription postal rate

- Image ID: D2EX70
Detail photo of a stamp. The stamp shows a danger sign "Upward gradient" with the German inscription postal rate
Gunter Kirsch / Alamy Stock Photo
Image ID: D2EX70
Detailansicht einer Briefmarke. Die Marke zeigt ein Gefahrenzeichen "Steigung" mit der Beschriftung Porto | Detail photo of a stamp. The stamp shows a danger sign "Upward gradient" with the German inscription postal rate