Lyle check this previous post out
http://www.mapleleafup.org/forums/sh...ght=turd+brown
there is a good picture of 4 different colours used on Canadian machines. Perhaps you can show this to the vet, also, Hanno gives a recipe for mixing up the colours using model paint. For a couple of bucks you could do up some colours and show the vet and perhaps tweak them a bit. Remember that these vehicles weren't washed regular too, so that may make some of the deep colour appear different in ones memories.
Sean