I've found a couple of pictures of the "Ford Thunderbird Deseo" but can't read any badges at all, so I can't say if it was written on the car or not..
If we take the path of continuing despite the Locomobile error then the puzzle has effectively ended at Isuzu Deseo, unless it has to be written as Isluzu Deseo Concept, but that opens up a new can of worms as what concept car actually had "Concept" written on it?! Is "Concept Car" a name or a description? I wouldn't support allowing "Concept" as a name.
PersonallY I would take Otto's Option 1 and reset the puzzle at pguillem's Locomobile Model 48 Tourer and just ignore all the posts since then, as that maintains continuity and the integrity of the puzzle. It's easy to do, just carry on from that post.. But what do other Admins think?