Vintage color chrome postcard showing a perspective view across the roadway of the Straits of Mackinac Bridge, featuring suspension cables, green railing, overhead lampposts, support towers, and period automobiles crossing the straits.

• Front Caption: "Straits of Mackinac Bridge"
• Type: Chrome Postcard
• Era: Circa late 1950s–1960s
• Size: Standard postcard (approx. 3.5 x 5.5 inches)
• Format: Color photo-offset, divided back

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