Often sellers look at the registration and the only reference to the year of the car is the date first sold.
This is probably a 68 first sold in 67, until we see the VIN attached to this car there is no way to know if there is anything wrong with the car.
Some people like the 68 better than the 67, maybe they swapped some parts to make there 67 look like a 68.
Again with seeing the VIN there is no way to know, I write this one off to uninformed seller.