1 April 1871
the first Danish Postal Cards are introduced, and the
imprinted
stamps are the same type as the bi-coloured
stamps. But the Postal Cards are only printed in one colour, and are therefore
not bi-coloured, but anyway the Postal Cards are also
called "bi-coloured".

4
skilling postal card with "bi-coloured" stamp imprint
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In
1870 the first Danish stamps in two colours
are introduced. This type is still today known as
"the bi-coloured" stamps.
4 skilling bi-coloured stamp
If you
want to know more about the bi-coloured stamps, please look at
the websites of
Henrik Mouritsen,
Leif Oerndorf
and
KPK (Københavns Philatelist Klub). And there is
lots of
literature on the
subject.
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