I always thought it meant the car had been owned by a pirate.![]()
AR was a designation given by Ford to parts that were obsoleted on early 1928 Model A's. Mostly these obsoleted parts related to the early left hand emergency brake system that had to be phased out due to threatened legislation from certain states. In general AR has been used in the vernacular to identify the car as having early 1928 features.
This is the first I have heard about the threatened legal action. Pretty interesting! I have an E28 with the emergency brake on the left side.