1958 Continental sedan in black
https://media.beige.party/media_attachments/files/113/697/009/637/835/073/original/f8c5d032377b5843.jpg
That's what I've always heard too, Lancia Lambda in 1923.
The 1934 Chrysler Airflow was unbody.
Ford's first unibody was the massive 1958 Continental.
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