The spanish doubloon 2022 (The Bull) has the inclusion on the obverse of a security measure patented by the Fábrica Nacional de Moneda y Timbre - Real Casa de la Moneda itself, the quadruple latent image. This security measure makes it possible to see four different images in the same space on the coin, depending on the incidence of light and the angle at which it is viewed. The coin features the mintmark, a five-pointed star, the graphic euro symbol and the silhouette of the "pillar of Hercules".
The effect is achieved on the metal, engraving a succession of square-based pyramids.
Each face of the pyramid works as a pixel so that all sides with the same orientation form a complete image.
The Spanish Royal Mint (FMNT) patented the system with two faces long time ago, now the patent is expired and other mints like the Royal English Mint, used this kind of images with to faces, and because of that, the FMNT invented the system with four faces.
You can see the system. From 3:00 minut.
What do you think? Is that the best system anti-counterfeiting that you cand find in a coin gold or not, right now?