The series of 1918 five dollar bill is known a federal reserve bank note. It looks similar to other bills from the teens except that Abraham Lincoln is pictured on the left hand side of the bill. The same design was used for some 1915 $5 bills (FYI). Both $5 bills from 1915 and 1918 have a blue seal and serial numbers. The value of these bills is really just based on the condition and issuing district. Things like the serial number are also important.