Hat tip: The following information, designed to help people determine the manufacturing dates of their Sangamo Electric watthour meters, was provided by SangamonLink reader David Dahle. Our thanks to him.
Sangamo/Schlumberger watthour meter serial log
Year Serial Numbers Description
1899 1 Gutmann Type A
1900 2001
1901 4001
Nov. 1 1901 6001 Switchover to Gutmann Type B
1902 9501
1903 15201
Nov. 11 1903 29100 Final Gutmann Type B
1904 29101 – 33000 Type C mercury-motor meter
1905 50000 Type D (early) mercury-motor meter
Mar. 1 1906 55000 Type D (late) mercury-motor meter
1907 59001 Type E mercury-motor meter
1908 71001 Type F mercury-motor meter
1909 84001
1910 100,001
Feb. 1 1911 115,001 Type H singlephase AC meter
1912 155,001 Type H polyphase AC induction meter
1913 185,501 Type D-5 mercury-motor meter
200,000 Type D-5 (3-wire) mercury-motor meter
1914 270,501
Aug. 1 1914 330,000 Type H2 singlephase AC meter
1915 370,001 Type MS (?)
1916 446,001
1917 601,666
1918 770,001 Type D-5 horizontal version supersedes vertical version
1919 992,815
1920 1,213,001
1921 1,472,894
1922 1,800,435
1923 2,194,454
1924 2,633,703
1925 3,026,674
1926 3,428,717
1927 3,892,941
1928 4,476,016
1929 4,827,200
1930 5,082,908
1931 5,435,720
1932 5,690,131
1933 5,815,053
1934 5,844,328
1935 6,467,326
1936 6,966,946
1937 7,297,909
1938 8,125,349
1939 8,380,383
1940 9,107,173
1941 10,255,808
1942 10,682,819
1943 10,813,462
1944 10,823,883
1945 10,939,790
1946 11,245,703
1947 11,817,616
1948 12,575,682
1949 13,654,650
1950 14,785,260
1951 15,755,883
1952 16,587,528
1953 17,312,275
1954 17,977,769
1955 19,666,001
1956 20,763,926
1957 21,441,643
1958 22,207,116
1959 22,918,159
1960 23,478,586
1961 24,365,977
1962 25,567,691
1963 27,001,807
1964 28,000,000
1965 29,200,000
1966 30,000,000
1967 31,000,000
1968 32,000,000
1969 33,000,000
1970 34,000,000
1971 34,150,000
1972 38,501,081
1973 39,000,000
1974 40,500,000
1975 44,000,000
1976 45,500,000
The original Springfield, Illinois, plant closed at the end of 1976.
Sangamo and Schlumberger meters made at the “Oconee” (South Carolina) plant
1970 35,000,000
1971 36,000,000
1972 37,075,000
1973 39,200,000
1974 41,000,000
1975 42,600,000
1976 44,500,000
1977 46,000,000
1978 47,500,000
1979 49,250,000
1980 54,000,000
1981 57,000,000
1982 60,000,000
1983 62,000,000
1982 60,000,000
1983 62,000,000
1984 66,000,000 Last Type J4 meters made
1984 68,000,000 S series polyphase
1984 68,500,000 First Type J5 meters made
1985 70,000,000 J5 singlephase
1985 72,800,000 S polyphase
1986 74,000,000 J5 singlephase
Schlumberger rather than Schlumberter
Corrected. My error, not David’s. Thanks, Nancy.
I have a Sangamo Demand meter
Type AGX3
NO. 78099 Motor volts 120 DC
INT. 15 MIN.
Face of dial says K.W. demand
multiply by 1.333
I have recently came across a lamp made from one of your meters it is a type JA i believe it was manafactured in 1952. It is the neatest thing i have ever seen i am from okla and the meter is stamped with okla gas and elect co such a wonderful fine. Patty harris