These 2 Mauritius stamps, Scott 370-371, were printed on Heidelberg K-Offset presses in 1970. They are not valuable (by cat) stamps. Historically they mark the inauguration of Lufthansa's Frankfurt/Mauritius route. Stamps were designed by Prof. Herbert Post, in Munich and printed in the Federal Rep of Germany on Heidelberg K-Offset Presses. I remember that my Father's Printing shop had Heidelberg offset presses.