U.S. Stamp Identifier

Get the inside scoop on how to distinguish valuable U.S. postage stamps from 
the common varieties with our U.S. Stamp Identifier. 
 1847 First Issues vs Reprints (#1 vs 3, #2 vs 4)
 1867-1871 Grilled Issues (#85C to 141)
 1869 15¢ Columbus Type I & II (#118, 119)
 1870-1888 Hard and Soft Papers (#134 to 191)
 1873-1879 Secret Marks (#156 to 191)
 
 
 
 
 
 
 
 
 
1912-1921 2¢ Washington Types I, II and III (Engraved Printings)
1918-1920 2¢ Washington Types IV, V, Va, VI and VII (Offset Printings)
 1908-1918 3¢ Washington Types I to IV