1926 Pennsylvania Dept. of Highways Brass Bridge Plaque - Keystone Shape
Historical ContextThe Pennsylvania Department of Highways, established in 1903 as a successor to earlier state road bureaus, was responsible for building and maintaining the state's growing network of roads and bridges in the early 20th century. By the 1920s, amid post-World War I economic growth and increased automobile use, the department undertook numerous projects, including bridges, often marking them with such plaques. The keystone shape symbolizes Pennsylvania's nickname as the "Keystone State," a motif commonly used in official signage like route markers and historical indicators. While similar in design to the department's roadside keystone markers (introduced around the same time for towns, streams, and points of interest), this appears to be a distinct type specifically for bridge infrastructure rather than general wayfinding. The department evolved into PennDOT in 1970, but items like this highlight its role in early highway development. Condition and CollectabilityPlaque shows typical age-related wear, including patina, minor oxidation, and edge chipping, which adds to its antique appeal—similar examples are described as having a "great patina" and are rarely found painted. Unused or well-preserved versions are uncommon, as most surviving plaques were salvaged from demolished or renovated bridges. They occasionally appear on collector sites and sales, with values ranging from $100–$300 depending on condition, though specific sale prices for identical 1926 pieces aren't publicly detailed in recent listings.
It could be from one of the many bridges built or improved in 1926, such as those in rural counties during the department's expansion efforts.
$225
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