Check that the banknote is genuine
Look, tilt, feel
In the lower-left corner of the note, there is a rectangle containing a ring. When you tilt the banknote in different directions, the ring appears to float and you can see a play of colours.
On the right-hand side of the banknote, you can see three segments of an anchor chain integrated into the paper. When you tilt the note, the chain appears to move.