Hologram Stamps - A Bit About These Newfangled Stamps, And A Stamp Trivia Question

You may have seen hologram stamps that have been issued by various countries. They're shiny,
"new" or "modern looking" and exhibit a three dimensional appearance to varying degrees.

Typical reflective hologram stamps are produced by transferring the uneven patterns resulting from recording an image on a photoresist material onto a plastic film that is then applied to silver or gold foil reflective material. Light reflects off the background and through the plastic film, making the pattern on the film visible. Because the pattern is uneven, the objects depicted on the stamp will be seen in 3-D.

Stamp Trivia Question:

Which country, in which year, produced the world's first hologram stamp?