American Waltham Age Determination by Movement Number
List from pocketwatchrepair.com:
Year
|
S/N
|
1852
|
50
|
1853
|
400
|
1854
|
1000
|
1855
|
2500
|
1856
|
4000
|
1857
|
6000
|
1858
|
10,000
|
1859
|
15,000
|
1860
|
20,000
|
1861
|
30,000
|
1862 |
45,000
|
1863
|
65,000
|
1864
|
110,000
|
1865
|
180,000
|
1866
|
260,000
|
1867
|
330,000
|
1868
|
410,000
|
1869
|
460,000
|
1870
|
500,000
|
1871
|
540,000
|
1872
|
590,000
|
1873
|
680,000
|
1874
|
730,000
|
1875
|
810,000
|
1876
|
910,000
|
1877
|
1,000,000
|
1878
|
1,150,000
|
1879
|
1,350,000
|
1880
|
1,500,000
|
1881
|
1,670,000
|
1882
|
1,835,000
|
1883
|
2,000,000
|
1884
|
2,350,000 |
1885
|
2,650,000
|
1886
|
3,000,000
|
1887
|
3,400,000
|
Year
|
S/N
|
1888
|
3,800,000
|
1889
|
4,200,000
|
1890
|
4,700,000
|
1891
|
5,200,000
|
1892
|
5,800,000
|
1893
|
6,300,000
|
1894
|
6,700,000
|
1895
|
7,100,000
|
1896
|
7,450,000
|
1897
|
8,100,000
|
1898
|
8,400,000
|
1899
|
9,000,000
|
1900
|
9,500,000
|
1901
|
10,200,000
|
1902
|
11,100,000
|
1903
|
12,100,000
|
1904
|
13,500,000
|
1905 |
14,300,000
|
1906
|
14,700,000
|
1907
|
15,500,000
|
1908
|
16,400,000
|
1909
|
17,600,000
|
1910
|
17,900,000
|
1911
|
18,100,000
|
1912
|
18,200,000
|
1913
|
18,900,000
|
1914
|
19,500,000
|
1915
|
20,000,000
|
1916
|
20,500,000
|
1917
|
20,900,000
|
1918
|
21,800,000
|
1919
|
22,500,000
|
1920
|
23,400,000
|
1921
|
23,900,000
|
1922
|
24,100,000
|
1923
|
24,300,000
|
Year
|
S/N
|
1924
|
24,550,000
|
1925
|
24,800,000 |
1926
|
25,200,000
|
1927
|
26,100,000
|
1928
|
26,400,000
|
1929
|
26,900,000
|
1930
|
27,100,000
|
1931
|
27,300,000
|
1932
|
27,550,000
|
1933
|
27,750,000
|
1934
|
28,100,000
|
1935
|
28,600,000
|
1936
|
29,100,000
|
1937
|
29,400,000
|
1938
|
29,750,000
|
1939
|
30,050,000
|
1940
|
30,250,000
|
1941
|
30,750,000
|
1942
|
31,050,000
|
1943
|
31,400,000
|
1944
|
31,700,000
|
1945
|
32,100,000
|
1946
|
32,350,000 |
1947
|
32,750,000
|
1948
|
33,100,000
|
1949
|
33,500,000
|
1950
|
33,560,000
|
1951
|
33,600,000
|
1952
|
33,700,000
|
1953
|
33,800,000
|
1954
|
34,100,000
|
1955
|
34,450,000
|
1956
|
34,700,000
|
1957
|
35,000,000
|
|
|
Source: pocketwatchrepair.com