Old Koban: 20 Sen Dark Blue
Genuine
Issued 18 August 1877 – Scott #65 and Sakura #74
Genuine: unused
Forgeries with Genuine
Maeda
Lithographed
State I: Sankō on either side above bottom group of characters in oval band.
Maeda
Lithographed
State 2: same as State 1 with sankō erased
Wada: Plate 11
Engraved
No sankō but with six different printed cancels. None are known with fake normal-appearing cancels.
Wada: Plate 26
Lithographed
No sankō but with printed cancels. None are known with fake normal-appearing cancels.
Wada: Plate 11
Engraved
State 1, with fine engraving and six different printed cancels.
Wada: Plate 11
State 2 retouched with the six different printed cancels.
Wada: Plate 26
Lithographed
Six different printed cancels. The lithographed plate designs were produced by multiple copying of a common die. Plate size is undetermined.