Issued by Belgium, this finely engraved 2.50 franc stamp depicts the impressive Zelzate bascule bridge opening to allow a cargo vessel to pass through the canal, symbolizing the nation’s industrial waterways and maritime trade strength. The cool blue monochrome design highlights precise architectural lines, tugboats, and port infrastructure, making it a classic example of European engineering-themed philately. Released in 1970, it reflects Belgium’s modern transport development era. The detailed steel engraving and scenic composition appeal strongly to topical collectors of ships, bridges, and industry. A beautiful addition for maritime or infrastructure collections.