Issued in 1986 by East Germany (DDR), this attractive two-stamp set highlights historic and modern achievements in water management infrastructure. The 50 Pfennig stamp features the Wasserwerk Berlin-Friedrichshagen (1893), an important 19th-century waterworks facility symbolizing early urban water supply engineering. The 70 Pfennig stamp depicts the Rappbode Dam (1959), a major dam project representing modern hydraulic engineering in the Harz region.

Both designs are finely engraved-style architectural studies with strong geometric framing, typical of late DDR commemorative issues. The contrast between historic industrial architecture and post-war engineering progress makes this set especially appealing for thematic collectors.

A desirable pair for collectors of architecture, engineering, industrial heritage, and German history.