Occasionally, I bump into stamp tabs such as these:

http://groups.msn.com/Stamps/shoebox...to&PhotoID=190

I was wondering, if the habit of adjoining tabs was widespread
in the Romanian collection?

Does the tab increase the value of the adjoining stamp?

In the case of Copernicus, I guess the tab advertises a Philatelic
convention in Poland? was this a joint effort?

Any info would be appreciated.
Thanks


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