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Mattress saddle
From WikiPedalia
A traditional upholstered saddle, as used on older, less-expensive English 3-speeds (better models used leather saddles.) A mattress saddle has multiple small coil springs running along between the front and rear of the frame, covered with a layer of felt or horsehair, and a leatherette/vinyl top. This type of saddle almost always has large coil springs at the back of the frame.
