Porcelain sign? License Plate? Railroad marker?

By David Boothroyd; posted February 17, 2008

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I found this about 4 years ago in a dump across the street from a railroad yard and I haven't been able to identify it. It looks like a license plate but is larger than any I have seen. This photo was taken right after I found it. Any ideas on what it is? Any help would be appreciated. The dimensions are 15" x 6". UPDATE- Thanks to Leon Prestia who informed me that this may be a license plate from 1920's Shanghai China.

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