Bertram of Minden (1345 - 1415), also known as Master Bertram, was a German international Gothic painter primarily of religious art. His most famous surviving work is the large Grabow Altarpiece also known as the Petri Altar, painted around 1383. Originally located in St. Petri church, it is now in the Hamburger Kunsthalle in Hamburg, Germany. This beautiful postcard with matching stamps and special pictorial postmark was posted by my best correspondent friend Erhard Molbitz.
