YOU WILL GET WHAT YOU SEE

What exactly are Ueberreuter stamp proofs?

"Yemen, 1980s Issues Proofs and Essays, prepared by the Carl Ueberreuter firm of Austria, commems and air mail issues encompassing a wide variety of topicals and incl variations of actually issued stamps colorful and eye-catching topical appeal."

Carl Ueberreuter Druckerei GmbH, Korneuburg, Vienna.
Founded: 1548.