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[modelsof1900]

Well Bernhard,, If you have an old car, that's always a good source. And if you don't, ask a friend that does if you can " clean it up a bit " for them. . Or volunteer at a near by rail museum... I'm sure there is plenty of rust their that you could gather up. 8-)

Thanks for these wondeful ideas. And sorry, the cars are sanctuaries here, most clean, waxed and polished without each mark of rust - in most cases. However I know a scrap dealer near to me, so I will look on his yard. I am sure that I will have success there!
And our rail museum will be the second address.