Simple Device Makes Signs Instantly Interchangeable (Jul, 1932)

What I find interesting about this is, was this just a test sign? Or did people really used to go into a gas station and shop for gasoline by brand?

Simple Device Makes Signs Instantly Interchangeable

WITH the price of gasoline changing almost daily, station attendants will welcome the new metal sign system, shown on the left, which allows price notices to be changed in a jiffy—without altering the sign’s neatness.

The name plate is equipped with a bracket which slips over the metal post and is clamped tight. The lower edge of this plate is bent to provide a flat sleeve and a longitudinal slot. Price plates have a flat, solid head which slides into this slot and is locked by pressure.

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2. Street Signs Will Aid Tourists (Aug, 1929)
3. Tiny Blimps Carry Flying Electric Signs (Nov, 1939)
4. Newsboys Wear Neon Signs (Jan, 1937)
5. Early Neon Signs (Oct, 1923)