The 25th ACO anniversary is still regarded as a special milestone by the company's employees. ACO in Andernach, founded in 1948, was the Group's leading plant at the time. When the 25th anniversary was celebrated there in 1973, Severin Ahlmann also took the opportunity to celebrate the anniversary at the Rendsburg and Reith sites, albeit 1.5 years “late” for these sites founded in 1946.

Here Severin Ahlmann in front of the former logo during the celebrations in the Baltic seaside resort of Damp, which lasted several days.