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Iowa state highway 1 sign.

1948 specification reassurance marker. Manufactured between 1948 and 1955.

Iowa City. The backs of the infinitely durable cast-iron shields were reused to create retroreflective markers in the late 1940s and 50s.

Photo by Jim Lindsay, 4/26/1976.

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total shield images in the gallery. Last updated on 10/12/2017.
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