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  Colin
  
  As far as I can determine, originally black & white postcards were hand-painted, usually by low paid female workers. Later as colour printing became possible/cheaper cards were printed in two runs, first the normal B&W, then over printed in colour. This of course allowed the printers to 're use' old designs.
  
  
  This is only what I can derive from the Internet and I am sure there is much more to these processes. It needs a postcard collector/expert for a definitive answer.

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