Model A coupe serial number question

[skidmarks]

Looked at a 1930 standard coupe today. Story is that it's supposed to be from Canada. Serial number is CAT22**. This seemed odd to me. All the 30-31 model A's I have had all started with just the letter A. I did not see the car in person just pictures of it however i had the title in my hands which is a Pennsylvania title issued in 1994.