I agree - it looks like a factory tag with a misstamp. Which means the it was either supposed to be 9N612306 which would line up with the trim tag, or they mixed up the VIN sequence number with the Firebirds (and the tag was swapped).
You'd have to check the hidden VIN to find out, but I'd guess it was a typo 9N112306 instead of 9N612306.
I can think of at least 4 VIN typos on 69's - hard to catch typos like that, the VIN wasn't used in the plant to track the vehicle so very few people looked at it.