This is definitely an EU VIN. After 25 years, cars can be imported into the US, so there are definitely non-NA VIN cars driving around the US. And prior to 1981, it was basically a free for all. I have a car with an 8 digit VIN!
Sorry, I missed this comment before replying to your email, that's interesting about the difference in check digit! I will definitely look into supporting more VINs