@bigdub During The Great Depression, some automobile manufacturers provided one taillight as standard; the second was optional. There were buyers of bottom-of-the-line cars, such as this 1937 Ford Standard Model, who didn't want to spend the extra money to be able to be seen better at night, and the manufacturers saved the cost of including it, keeping the company's accountants happy. I saw what I consider such cheapness and stinginess as humorous from the perspective of the passage of 84 years. My thinking is that if you could afford a new car at the time, the nominal cost of the additional safety wouldn't hurt the budget.
Every picture tells a story.