Here is a British made 1940's ( I think) Kismet Duplex Master foot pump.
Very complex clever design, incorporating a small cylinder and piston inside a larger one. Unusual flat coil return spring. Excellent in use. Restored using Hammerite Satin Silver and black, and smooth red. Many hours buffing the brass and steel parts. New leather seals throughout. Outstanding quality pump. I can't imagine what these would cost to make if they were still available today!
Very complex clever design, incorporating a small cylinder and piston inside a larger one. Unusual flat coil return spring. Excellent in use. Restored using Hammerite Satin Silver and black, and smooth red. Many hours buffing the brass and steel parts. New leather seals throughout. Outstanding quality pump. I can't imagine what these would cost to make if they were still available today!