Only square or rectangular. No, the stamp in the world has also taken on other shapes, now we see it.
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It is true, most stamps have a rectangular or square shape. The Penny black for example, was rectangular in shape arranged with the base represented by one of the narrowest sides. This shape was replicated by other countries in their first issues. In 1843 Brazil, with the issue of its Occhi di bue, was the first country to use the rectangular shape with the base formed by the longest side.
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But there was also a round stamp. The first circular stamp was issued in Italy by the Grand Duchy of Tuscany on October 1, 1854.
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Italian Sport - Italian Stamps
It was composed of an extraordinary double circle stamp printed on very thin yellowish paper and containing colored anti-counterfeit threads.
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The first square stamp was issued in Italy in the Duchy of Modena on February 18, 1859. It was a value for newspapers and featured in the vignette the crowned Este eagle inside a circle and surrounded by the words "tassa gazzette cent. 10".
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The first triangular stamp was issued in 1853 by the Cape of Good Hope.
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As if that were not enough, there are stamps in the shape of fruit, hearts, rhombuses, coats of arms, up to the Sierra Leone stamp in the shape of a golden eagle printed in relief on a black background, with a self-adhesive glue and protected by a removable sheet of paper.