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Presto Brite sign boxes were common sights under 4-way signals in Seattle and a few other locations in the Pacific Northwest. They appeared around World War II which could explain what appears to be the use of a few recycled materials in their construction.
Typical Presto Brites consisted of a box frame constructed of 1/2" angle iron with four 12" x 18" openings for signs, a sheet metal top that was screwed down to the frame, four light sockets with one placed in front of each sign panel, and translucent fiberglass sign panels. The panels were held in place by short pieces of angle iron held in each corner by 1/4" machine screws.
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