That's been my question all along....... The registered VIN doesn't match up with the cowl tag, yet that's the number registries accepts. Other than the paperwork, there is no evidence of the VIN. on the car.
I got a chance to decode this tag, came up with the date you found, but like you said, It's a Baltimore tag..... #780 is a green cloth interior with buckets, #45 is Green Mist exterior. Just not sure how it got to be registered as a Flint car..... Unless someone git their "B"s and "F"s confused.
Not sure if I want to open that can of worms either..... Everything appears to be legal so far.