While it was often done by the company pouring concrete in Austin, Maufrais Bros. was the ones most often seen.

Maufrais Bros. Ready Mix Plant was located at 1st Street on the East side of North Lamar.

http://www.texasescapes.com/AustinTexas/Austin-Sidewalks-Maufrais.htm

Below are other examples of curb markings you’ll see around Austin.

A couple of others that were around after I got to town in the business in 1971 that still stamped their work was Terry Edwards Construction & Mueller Bros.