Burelage

A burelage' is a fine repeated pattern of lines or dots. It can be an underprint on the front or back of a stamp, done for security purposes, making the whole design harder to forge.

A subtype is the moiré pattern, basically two burelage patterns overlapped to make the resulting pattern even more complicated.

In many cases, a burelage pattern can be found inverted and is a collectible variety.

 File:Mongolia 1943.jpg|1943 5m Mongolia. File:Alsace-Lorraine A.jpg|France under occupation by German following the Franco-Prussian War. 

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