Výrobní čísla Winchester Modelu 1866 se překrývají a navazují na výrobní čísla Henryovek.
| Winchester model 1866 (Yellou Boy) | |
| Year | Serial Number |
| 1866 | 12476 |
| 1867 | 14814 |
| 1868 | 14479 |
| 1869 | 19769 |
| 1870 | 29517 |
| 1871 | 52528 |
| 1872 | 88184 |
| 1873 | 109785 |
| 1874 | 118402 |
| 1875 | 125039 |
| 1876 | 125966 |
| 1877 | 131908 |
| 1878 | 148208 |
| 1879 | 150494 |
| 1880 | 152202 |
| 1881 | 154380 |
| 1882 | 157108 |
| 1883 | 159514 |
| 1884 | 162377 |
| 1885 | 163650 |
| 1886 | 163665 |
| 1887 | 165072 |
| 1888 | 165913 |
| 1889 | 167156 |
| 1890 | 167402 |
| 1891 | 167703 |
| 1892 | 0 |
| 1893 | 169004 |
| 1894 | 169008 |
| 1895 | 0 |
| 1896 | 0 |
| 1897 | 169012 |
| 1898 | 169016-174100 |