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I know you often see them all polished up on show cars... but am I correct in thinking that these were originally painted? If so, then other materials than brass might also work for a repro.
[/ QUOTE ]Actually, I think one usually saw one painted (essentially the "body in white" number) and one brass (for the fully painted and trimmed body)...except for the TR3Bs, which seem to have had only one body number plate.