In 1957, the familiar "new" red, white, and blue logo was phased in.
There were several different sizes and styles, as with the previous logo versions. Internally illuminated signs came into use by the early 60s.
Here's an illuminated version:
In some cases, the 1957-up version of the sign (porcelain or internally lit) could be seen on a spiffy curved pole like this one:
There's lots more to come, including some more interesting ID signs, curb signs, flanges, and more! Stay tuned...