I think the German ones are from a power tool randomly run across instead of a straight file, but I dont think the lows are real low just a couple of thousands different. Power hammer or hand pounded, the faces would have been about the size of a 5 pound sledge or better. Might be similar tools but used at different stages from the English. Here is something on engine turning.http://www.workingpsychology.com/div.../jeweling.html I tried looking at the Science Museum pictures and it has a smooth cowl; I guess a modern replacement?
http://www.ddclassic.com/ferrari_body.html look for the nose picture. These old cars looked like that underneath but modern restoration removes the old handwork The cowl is a much simpler shape than the car; I think that is why it has more regular shapes.