| The above Washington Two Cent stamp was issued in the years 1908 to 1917. It was issued with different Perforation, watermarks, and paper. Some were issued in coils, and some were issued imperferated. The following table describes their differences. |
| Year | Perforation | Watermark Type |
| 1908 - 1909 | Perf = 12 |  |
| 1910 - 1911 | Perf = 12 | USPS |
| 1908 - 1910 | Coil = 12 Hor. | |
| 1909 | Coil = 12 Vert. | |
| 1910 | Coil = 12 Hor. | USPS |
| 1910 - 1911 | Coil = 12 Vert. | USPS |
| 1908 -1909 | Imperf. | |
| 1911 | Imperf | USPS |
| 1910 | Coil = 8.5 Hor. | USPS |
| 1910 - 1913 | Coil = 8.5 Vert. | USPS |
| 1917 | Perf = 11 | |
| The above Washington One Cent To One Dollar stamps were issued in the years 1912 to 1921. It was issued with different Perforation, watermarks, and paper. Some were issued in coils and some were issued imperferated. The following table describes their differences. |
| Year | Perforation | Watermark Type | Types | Denomination |
| 1908 - 1909 | Perf = 12 |  |
N/A | 3c - $1.00 |
| 1910 - 1911 | Perf = 12 | USPS | N/A | 3c - 15c |
| 1912 - 1914 | Perf = 12 | USPS | N/A | 1c & 2c & 7c |
| 1908 - 1910 | Coil = 12 Hor. | |
N/A | 4c & 5c |
| 1909 | Coil = 12 Vert. | |
N/A | 4c & 5c & 10c |
| 1910 - 1911 | Coil = 12 Vert. | USPS | N/A | 3c |
| 1908 - 1909 | Imperf | |
N/A | 3c & 4c & 5c |
| 1912 | Imperf | USPS | N/A | 1c & 2c |
| 1914 | Imperf | USPS | N/A | 2c |
| 1916 - 1917 | Imperf | UnWmkd | N/A | 1c & 2c |
| 1916 - 1917 | Imperf | UnWmkd | 1 & 2 | 3c |
| 1918 - 1920 | Imperf | UnWmkd | 4 & 7 | 2c |
| 1918 - 1920 | Imperf | UnWmkd | 4 | 3c |
| 1912 | Coil = 8.5 Hor. | USPS | N/A | 1c & 2c |
| 1912 | Coil = 8.5 Vert. | USPS | N/A | 1c & 2c |
| 1910 - 1913 | Coil = 8.5 Vert. | USPS | N/A | 3c & 4c & 5c |
| 1914 - 1915 | Perf = 10 | USPS | N/A | 1c & 2c & 3c - 7c |
| 1916 - 1917 | Perf = 10 | UnWmkd | N/A | 1 & 2 & 3 - 7 |
| 1919 - 1921 | Perf = 10 | UnWmkd | N/A | 1c |
| 1914 | Coil = 10 Hor. | USPS | N/A | 1c & 2c |
| 1915 - 1916 | Coil = 10 Hor. | USPS | N/A | 1c |
| 1915 - 1916 | Coil = 10 Hor. | USPS | 1 & 3 | 2c |
| 1914 - 1916 | Coil = 10 Vert. | USPS | N/A | 1c |
| 1914 - 1916 | Coil = 10 Vert | USPS | 1 & 2 & 3 | 2c |
| 1914 - 1916 | Coil = 10 Vert. | USPS | N/A | 3c & 4c & 5c |
| 1916 - 1919 | Coil = 10 Hor. | UnWmkd | N/A | 1c |
| 1916 - 1919 | Coil = 10 Hor. | UnWmkd | 2 & 3 | 2c |
| 1916 - 1919 | Coil = 10 Hor. | UnWmkd | 1 | 3c |
| 1916 - 1922 | Coil = 10 Vert. | UnWmkd | N/A | 1c |
| 1916 - 1922 | Coil = 10 Vert | UnWmkd | 2 & 3 | 2c |
| 1916 - 1922 | Coil = 10 Vert | UnWmkd | 1 & 2 | 3c |
| 1916 - 1922 | Coil = 10 Vert | UnWmkd | N/A | 4c & 5c |
| 1915 | Perf = 11 | USPS | N/A | 2c |
| 1917 - 1921 | Perf = 11 | UnWmkd | N/A | 1c |
| 1917 - 1919 | Perf = 11 | UnWmkd | 1 & 1a | 2c |
| 1917 - 1919 | Perf = 11 | UnWmkd | 1 & 2 | 3c |
| 1917 - 1919 | Perf = 11 | UnWmkd | N/A | 4c & 5c & 6c & 7c |
| 1919 - 1921 | Perf = 11 | UnWmkd | 3 | 2c |
| 1918 - 1920 | Perf = 11 | UnWmkd | 4 & 5 & 6 &7 | 2c |
| 1918 - 1920 | Perf = 11 | UnWmkd | 3 & 4 | 3c |
| 1918 - 1920 | Perf = 12.5 | UnWmkd | N/A | 1c |
| 1919 - 1921 | Perf = 11 x 10 | UnWmkd | N/A | 1c |
| 1919 - 1921 | Perf = 11 x 10 | UnWmkd | 2 & 3 | 2c |
| 1919 - 1921 | Perf = 11 x 10 | UnWmkd | 2 | 3c |
| 1919 - 1921 | Perf = 10 x 11 | UnWmkd | N/A | 1c |