Best I have done was while stripping the interior of my 34 Plymouth I happened to find a Detroit police badge. I turned it into the local 50's and to my suprise (and horror) it had once belonged to a famous gangster of the early 30's (well at least it had been a souvineer from one of his "hits"). Later found out that the car had belonged to this infamous US citizen before being imported to New Zealand in the 1950's. Wound up selling the car to a local musem here in NZ for a pretty few dollars, given that it had once been al capones ride!