the international philatelic exhibition in Brussels at the close of the 19th century....
many philatelic exhibitions issue labels. I don't know the earliest ones issued
you can see similar ones, from a national show, held in Minnesota in 1929. I sent a link to Tim, as he's very interested in Minn postal history, and, hence, had it handy to show you: http://www.ebay.com/itm/postal-history-Minneapolis-Mn-1929-Philatelic-Expo-tied-Seal-/262075616810
David
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