Two-color butterfly
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The new 50-peso banknote (F1 Type) is the only one that has this security element. It is a two-color butterfly divided by a rolling-bar that shifts when the banknote is tilted. On the front of the banknote, the two-color butterfly is in the upper left side. It is printed on a small clear window, also in the shape of a butterfly, which facilitates noticing the same two-color effect on the back of the banknote.
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