Although the "Graf Zeppelin" stamps are today highly prized by collectors as masterpieces of the engraver's art, in 1930 the recent stock market crash meant that few were able to afford these stamps (the $4.55 value for the set represented a week's food allowance for a family of four). Less than 10 percent of the 1,000,000 of each denomination issued were sold and the remainders were incinerated (the stamps were only available for sale to the public from April 19, 1930, to June 30, 1930). It is estimated that less than 8 percent of the stamps produced survive today and they remain the smallest U.S. issue of the 20th century (only 229,260 of these stamps were ever purchased, and only 61,296 of the $2.60 stamp were sold).