1928D $1 Blue Seal Silver Certificate "Funnyback" Key To Series Grades vf+. FR-1604 Julian-Woodin These were the first notes to be called funnybacks. The reason they are called funnybacks is because of the unique design on the back of the bill. The word 'one' is printed in a "funny" font that is quite different from anything ever printed on a bill. This nickname is not exclusive to the 1928 series, as the 1934 one dollar silver certificate bills have the same back design so they are also known as funnybacks. this $1 note was among the first small-size Silver Certificates. Although its face displays the sought-after blue seal marking it as a Silver Certificate, the back is what makes it so popular! The light green border and large, green ornamental ONE do not match the contemporary black-and-white face, leading to its nickname "Funnyback." Still considered legal tender though no longer payable in silver, this note is in great demand for its historical significance and unique design. With blue seal and serial numbers.