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DIEHARD
In the same way, for the vehicles that have their make identified since long time but that are missing the model, we can remove the unknown and list them with only the make. That's what I do for the make-only vehicles that are unknown for long time.
You could add a "Type unknown" tag, that way people who do know the model/type still can see that they can add information to identify the type.
Further, I think it is good to still maintain the unknown category, new members sometimes add usefull information, so that a type still can be identified. I think it is good keeping them, even if the pictures are not that great....