Information courtesy of Graham Forsdyke of ISMACS

SINGER SEWING MACHINES
======================
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Serial Number			Date of Manufacture
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1-100				1850
101-900				1851
901-1711			1852
1712-2521			1853
2522-3400			1854
3401-4283			1855
4284-6847			1856
6848-10477			1857
10478-14071			1858
14072-25024			1859
25025-43000			1860
43001-61000			1861
61001-79395			1862
79396-99426			1863
99427-123058			1864
123059-149399			1865
149400-180360			1866
180361-223414			1867
223415-283044			1868
283045-369826			1869
369827-497660			1870
497661-678921			1871
678922-898680			1872
898681-1121125			1873
1121126-1362805			1874
1362806-1612658			1875
1612659-1874975			1876
1874976-about 2 million		1877
2 million to 3 million		1878-1880
3 million to 4 million		1881-1882
4 million to 5 million		1883-1884
5 million to 6 million		1885-1886
6 million to 7 million		1887-1888
7 million to 8 million		1889
8 million to 9 million		1890
9 million to 10 million		1891

Serial No. begins with N	1900
Serial No. begins with L	1901
Serial No. begins with K	1902-1903
Serial No. begins with B	1904-1905
Serial No. begins with H	1906-1907
Serial No. begins with D	1908-part of 1909
G 000000-G 999999		1909
G1000000-G2500000		1910-1912
G2500001-G4400000		1913-1915
G4400001-G6500000		1916-1918
G6500001-G8500000		1919-1920
G8500001-G9999999		1921-1923
G0000000-G0998000		1924
Serial No. begins with F	1924
Serial No. begins with Y	1925
Serial No. begins with AA	1924-1926
Serial No. begins with AB	1926-1928
Serial No. begins with AC	1928-1930
Serial No. begins with AD	1930-1935
Serial No. begins with AE	1935-1938
Serial No. begins with AF	1938-1941
Serial No. begins with AG	1941-1947
Serial No. begins with AH	1947-1948


CLYDEBANK SCOTLAND SEWING MACHINES
==================================
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Serial Number Begins With	Date of Manufacture
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M				Jan 1900 - Jun 1900
P				Jul 1900 - Dec 1901
R				Jan 1902 - Dec 1903
J				Jan 1904 - Dec 1905
S				Jan 1906 - Dec 1907
V				Jan 1908 - Dec 1909
F				Jan 1910 - Dec 1920
Y				Dec 1920 - Oct 1935
EA				Oct 1935 - Jan 1937
EB				Feb 1937 - Jan 1939
EC				Feb 1939 - Dec 1940
ED				Jan 1941 - Apr 1947
EE				Apr 1947 - Feb 1949

    Source: geocities.com/heartland/plains/3081

               ( geocities.com/heartland/plains)                   ( geocities.com/heartland)