Ingersoll age determination by serial number until 1944
| Year
|
Serial number
|
| 1892
|
150,000
|
| 1893
|
310,000 |
| 1894
|
650,000
|
| 1895
|
1,000,000
|
| 1896
|
2,000,000
|
| 1897
|
2,900,000
|
| 1898
|
3,500,000
|
| 1899
|
3,750,000
|
| 1900
|
6,000,000
|
| 1901
|
6,700,000
|
| 1902
|
7,200,000
|
| 1903
|
7,900,000
|
| 1904
|
8,100,000
|
| 1905
|
10,000,000
|
| 1906
|
12,500,000
|
| 1907
|
15,000,000
|
| 1908
|
17,500,000
|
| 1909
|
20,000,000
|
| 1910
|
25,000,000
|
| 1911
|
30,000,000
|
| 1912
|
38,500,000
|
| Year
|
Serial number
|
| 1913
|
40,000,000
|
| 1914 |
41,500,000
|
| 1915
|
42,500,000
|
| 1916
|
45,500,000
|
| 1917
|
47,000,000
|
| 1918
|
47,500,000
|
| 1919
|
50,000,000
|
| 1920
|
55,000,000
|
| 1921
|
58,000,000
|
| 1922
|
60,500,000
|
| 1923
|
62,000,000
|
| 1924
|
65,000,000
|
| 1925
|
67,500,000
|
| 1926
|
69,000,000
|
| 1927
|
70,500,000
|
| 1928
|
71,500,000
|
| 1929
|
73,500,000
|
| 1930
|
75,000,000
|
| 1931
|
76,000,000
|
| 1932
|
78,000,000
|
| 1933
|
82,000,000
|
| Year
|
Serial number
|
| 1934 |
83,000,000
|
| 1935
|
84,000,000
|
| 1936
|
85,000,000
|
| 1937
|
87,000,000
|
| 1938
|
89,000,000
|
| 1939
|
90,000,000
|
| 1940
|
92,000,000
|
| 1941
|
93,000,000
|
| 1942
|
94,000,000
|
| 1943
|
95,000,000
|
| 1944
|
96,000,000
|
| |
|
Source: pocketwatchrepair.com
