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The chassis numbering style changed with the production BT21s from F2-xx-66 to BT21-xx. The plates may have changed at the same point or possibly 12 months earlier.
A restorer showed me a replica pre-66 plate recently and although it wasn't made from the correct material (bakelite not plastic of course), it was visually extremely convincing. There are of course some very simple tests to tell plastic from bakelite.
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