Issued by Sweden in 1974, this 45 öre commemorative stamp marks the centenary of the sulphite pulp process (“Sulfitmassaprocessen 100 år”), a major milestone in the development of Sweden’s paper and forestry industry. The design features detailed technical blueprint-style drawings of early industrial pulp-processing equipment, reflecting the country’s engineering heritage. Printed in a monochrome brown tone, it has a distinctive industrial aesthetic highly appreciated by thematic collectors. Designed by Birgitta Lundberg and engraved by Zlatko Jakuš, the stamp represents Sweden’s leadership in paper production technology. A strong addition for industry, technology, and Scandinavian thematic collections.