It struck me as a lot of money for a car finished in primer….
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It isn't primer, it is German Army Panzer Grey... RLM 02.
As you probably know, se germans are very serious and have no sense of humour.
So I have to correct you: The standard for tank colour was RAL7021 Panzergrau, RAL is short for Reichsausschuss für Lieferbedingungen.
Sorry, couldn't resist.
Markus