Northeast of Dixon on Missouri 28 at the Maries-Pulaski county line, you can see the standard Missouri county-line marker and a not-so-standard marker. The Maries (pronounced "Mary's") county-line marker is the standard marker. On the other side of road is the Pulaski county-line marker with an extra logo, which definitely is not typical in Missouri.
The county markers used to have black lettering on a white background, but the current standard is for white letters on a green background.