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One comment if I may; I built a model of the DW-K Spitfire (610, County of Chester Squadron) as an Airfix kit as a teenager. I seem to recall that the serial number for DW-K should be N3029....??
Edit: I was right... see here:-
http://www.610squadron.com/about.php?cmd=about_aircraft
There was a later aircraft given DW-K with serial number X4067, but I think that your serial number is incorrect.....
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