You may see the term horse blanket or even saddle blankets, especially when referring to the large-size Series 1923 silver certificates. The face of those notes feature a portrait of George Washington.
At first glance the design looks like an early small-size Federal Reserve note, but a closer look reveals the note bears blue serial numbers, Treasury seal and a large numeral 1. Blue was the designated color for silver certificates.The back design is fairly plain, compared to other large-size silver certificates. The text across the back THE UNITED STATES OF AMERICA / ONE DOLLAR, nearly fills the center of the note. Three numeral 1s each appear on the right and left sides of the design. Large-size notes were first issued in 1861 when the federal government began printing demand notes. Large-size notes of all types continued to be printed and circulated until small-size notes were introduced in 1929. While those so-called horse blanket notes were large, at 3.125 inches by 7.375 inches it is an exaggeration to say they could cover a horses back underneath its saddle. The item "1923 $1 SILVER CERTIFICATE BANKNOTE UNCIRCULATED CERTIFIED PMG-20-VERY FINE" is in sale since Thursday, October 22, 2020. This item is in the category "Coins & Paper Money\Paper Money\ US\Large Size Notes\Silver Certificates". The seller is "brneknowles" and is located in Bellevue, Washington. This item can be shipped to United States.