There are some superb and incredibly useful reference books, and catalogues out there. And tools to measure perforations or paper thickness or LED magnifiers etc Please add your new discoveries - and recommendations to this forum. As in all forums, you can post photos of your favourites and recommendations.
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Does anyone know of any other Belgium Postmark Catalogues than this 1999 one?
I seem to recall a German/Dutch? one published a few years ago.
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