Issued by East Germany (DDR) in 1977, this 10+5 Pfennig semi-postal stamp commemorates SOZPHILEX ’77, the philatelic exhibition of socialist countries, marking the 60th anniversary of the October Revolution. The design, in bold red and blue, features a geometric motif with a central white circle and stylized lines symbolizing unity and cooperation. The surcharge (+5 Pfennig) went towards cultural purposes, reflecting the DDR’s tradition of charity issues. A striking example of socialist-era philatelic propaganda, this issue appeals to both thematic collectors and exhibition memorabilia enthusiasts.