Printed by the Bureau of Engraving & Printing (BEP)
from the original engraved plates in their archives. 
Being proof prints they are not money and are only
printed on one side.   They are as follows:

 1 - Face of 1905 $20 Gold Certificate.
 2 - Back of 1896 $1.00 Education Note (Martha & George Washington)
 3 - Back of 1890 $100 Treasury Note (Called the Watermellon note)
 4 - Face of 1896 $2.00 Education Note.
 5 - Bach of 1886 $5.00 Silver Cert. (engraving of 5 silver dollars)
 6 - BAck of 1915 $20 Fed. Res. Bank Note (neat engravings)