Dutch cinderellas about railways

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1973: Delfzijl harbour
Sheet issued on the occasion of the opening of Eems harbour and Delfzijl Harbour in the province of
Groningen on 7 June 1973. A number of railway tracks can be seen on the invalid stamp.
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1975: Amsterdam 700 years old.
Sheet issued on the occasion of the Amsterdam 700 celebration on 27 October 1975. The invalid stamp shows
De Dam with tram tracks.
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1978: 175 years Chamber of Commerce in Rotterdam.
Sheet issued on the occasion of 175 years Chamber of Commerce in the Rotterdam area on 17 October 1978.
Respectively the invalid stamps show a steam engine, a steam locomotive and a steam powered boat.
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