I am sorry Fëdor, your answer is correct but I had not unlocked the puzzle. While the default duration for locks is often 24 hours, they are ultimately at the discretion of the puzzler and in this case I had prolonged the lock for luisps (that's what I meant when I said "I'll give you more time to find out"). Therefore, I have to award him the point. No hard feelings, I hope.
This car was owned by the Maharajah of Udaipur, and is reportedly the only Moon in India, and one of only two or three (depending on the source) RHD units of this model. It was found in a bad state, restored and presented at the Cartier Concours in Delhi in 2015.
Unedited puzzle picture below.