Generally, this does mean that the car was resprayed. Not, that said, on rare occasion it has been reported that a few TR6s came from the factory without the black Kamm back. If the car you are looking at has the original paint, this could well be one of them. You should be able to look closely to tell if a car has been sprayed. Look in the trunk, under the dash, under the carpet, inside the doors, etc. If all these areas are well sprayed with a new paint job, you have a rare car indeed, one that was painted properly. That would be a sign of a body-off-frame resto.