This Datsun 17 from 1938 was originally a roadster but it got retrofitted doors and roof.
This specific car appeared on TV Tokyo's appraisal variety show and it was valued at 5 million JPY despite not being road registered. This high valuation was due to it's good overall condition and also thanks to the retrofitted doors and roof which were determined to be more refined and better made than the original when it was a roadster.
It's missing its de-registration documents but the owner is willing to help the new owner to prepare the necessary documents to register it once again and get license plates for it.