The new design of the 50-peso banknote (Type F1) is the only one that have got this security element.

It is about a butterfly with two colors divided by a rolling-bar that shifts when the banknote is tilted. In the front of the banknote, the two-color butterfly can be observed 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.