http://www.sismondostamps.com/World...Bolivia.html"Bolivian postage stamps are a classical illustration of the problems caused by irregularities in production and the impact of large-scale inflation. Bolivia was one of the South American countries that made efforts to commemorate pre-Columbian times in the images used on the stamps; the "Gate of the sun" set of nineteen stamps was authorised in 1926 to commemorate Bolivia's independence. The stamps were engraved and printed in Germany, and on learning that the stamps had been sold without permission in Europe, the authorities ordered the rest to be locked in a bank vault where they remained for thirty-five years; when eventually they were released in 1960, inflation had caused havoc to Bolivia's currency and they needed to be surcharged, sometimes to 10,000 times their original denomination "
(from Wiki)