Patek Philippe Watch Serial Number List
| serial number | year | serial number | year |
| 100 | 1839 | 72640 | 1885 |
| 1120 | 1845 | 85365 | 1890 |
| 3740 | 1850 | 101230 | 1895 |
| 7825 | 1855 | 111800 | 1900 |
| 14500 | 1860 | 124475 | 1905 |
| 22800 | 1865 | 153940 | 1910 |
| 36130 | 1870 | 174240 | 1915 |
| 47610 | 1875 | 193780 | 1920 |
| 55770 | 1880 | 202195 | 1925 |
These are approximate production dates. Oftentimes, a block of serial numbers would be assigned and the movement plates blanked out; then the plates would be stored in the warehouse and finished as demand required. So, it is possible that a watch could have been completed some years after the serial number date.