Poster produced by Greenpeace with the text 'It’s deadly serious Mr Reagan / Nuclear Weapons Testing must Stop', and a graphic portrait of Ronald Reagan, President of the United States, about 1985. This forms part of the Walt Patterson archive, and is autographed to Patterson from Greenpeace in silver pen in the top right-hand corner.

This Greenpeace poster calls for the end to President Ronald Reagan’s push to increase spending on America’s nuclear defence in the 1980s. Activists feared the devastating impacts that nuclear war would have on the environment. Walt Patterson was one of the UK’s leading campaigners for energy and environmentalism and collected his own archive of antinuclear materials.