Gabriel sent me a link to his amazing Uruguayan Graphic Design Archive when I launched Design Reviewed. The content was so amazing, I ended up spending a good hour looking through the content and it has definitely made it to my bookmarks.
The advertising agency played a crucial role in shaping consumer culture by acting as a bridge between businesses and the media and was stated to have started in the mid-19th century.
He designed stamps from around 1955 and in the book Karl Oskar Blase, Briefmarken-Design, Verlag für Philatelistische Literatur, 1981, he was described as one of the most influential stamp designers in Germany.