Done, sorry for the long delay.

However for the "unidentified 830", I've just listed them as "Horch [830]"; if they can't be identified more acurately than being from the 830 family I suppose there is no much point listing them as unknown (like the Mercedes W114/115/116/etc. that often can only be identified only by their W-code)

Same for a few "maybe" that I think are better than way than as unknown.