In 1929, all currency was changed to its current size. The first one-dollar bills were issued as silver certificates under Series of 1928. The treasury seal and serial numbers were dark blue. The obverse was nearly identical to the Series of 1923 $1 Silver Certificate, but the treasury seal featured spikes around it and a large gray one replaced the blue "1 DOLLAR." The reverse, too, had the same border design as the Series of 1923 $1 bill, but the center featured a large ornate one superimposed by one dollar. These are commonly known as "Funnybacks" due to the rather odd-looking "ONE" on the reverse. These $1 Silver Certificates were issued until 1934.
In 1933, Series of 1928 $1 United States Notes were issued to supplement the supply of $1 Silver Certificates. Its treasury seal and serial numbers were red and there was different wording on the obverse of the note. However, a month after their production, it was realized that there would be no real need for these notes and production was stopped. A small number of these $1 bills entered circulation and the rest were kept in treasury vaults until 1949 when they were issued in Puerto Rico.[citation needed]
In 1934, the design of the $1 Silver Certificate was changed to reflect the Silver Purchase Act of 1934. Under Washington's portrait, one silver dollar was changed to one dollar. The treasury seal was moved to the right and superimposed over one, and a blue numeral 1 was added to the left. The reverse remained the same.
A year later, in 1935, the design of the one-dollar bill was changed again. On the obverse, the blue numeral 1 was changed to gray and made smaller, the gray one to the right was removed, the treasury seal was made smaller and superimposed by washington d.c., and a stylized one dollar was added over the treasury seal. The reverse was also changed to its current design, except for the absence of in god we trust.
Special issue $1 Silver Certificate for Allied troops in North Africa
World War II brought about special issues of one-dollar bills in 1942. Special $1 Silver Certificates were issued for Hawaii in case of a Japanese invasion. hawaii was printed vertically on the left and right side of the obverse and also horizontally across the reverse.
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