A block of twelve U.S. 3c stamps depicting the Mackinac Bridge is affixed to the card/envelope front. Multiple circular Michigan postal cancels are dated 1958 (postmark reads Aug 25, 1958). The stamps are United States postage; no publisher or series imprint is visible. The back shows a handwritten Detroit address (street number and city readable) but no legible full recipient name
Notes for Cover Collectors: • High-resolution scans of front and back are provided; use zoom to inspect postmarks, cachet details, and backstamps. • No third-party grading; condition is shown in the images.