Large yellow box containing Buchanan's Improved Sarsaparilla and Seaweed Blood Tonic, to purify the blood and give a clear complexion in powder form to make one quart, by Potter' s (Herbal Supplies) Ltd.,Wigan, 1940-1960 Large yellow box containing Buchanan's Improved Sarsaparilla and Seaweed Blood Tonic 1940-1960