Over the past year, I've seen this postcard, or ones like it, being discussed on several Facebook pages. The postcard is of the Ambridge-Aliquippa Bridge* crossing the Ohio River, built in 1926-27.
I don't have much information about the postcard. It appears to be a bordered linen-era postcard, a type of postcard published roughly between 1930-45.
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Nancy Bohinsky Knisley grew up in Ambridge in the 1950s and 1960s. She is the author of Ambridge Memories, a blog dedicated to local history from 1950 to 1970. Visit ambridgememories.blogspot.com for more.