Wempe Chronometerwerke Hamburg Age determination of Marine Chronometers based on movement numbers

Year of manufacture / serial number

until 1939 until 2054

1940 to 2442

1941 to 2666

1942 to 3019

1943 to 3452

1944 to 4338

1945 to 4919

1946 to 5138

1947 to 5315

1948 to 5413

1949 no documents available

1950 to 5481

1951 to 5484

1952 to 5542

1953 to 5701

1954 to 5810

1955 to 6120

1956 to 6351

1957 to 6335

1958 to 6738

1959 to 6870

1960 to 7061

1961 to 7220

1962 to 7348, Bo 7361-7363

1963 bis7400, Bo 7364-7380, 9021-9080

1964 to 7497, Bo 9081-9090

1965 to 7680

1966 to 7910, Bo 9091-9101

1967 to 8200

1968 to 8505

1969 to 8760, Qo 12001-12036

1970 to 8940, Qo 12037-12210

1971 to 9080, Qo 12211-12400

1972 to 9182, Qo 12401-12601

1973 to 9184, Qo12602-12720

1974 to 9320, Qo 12721-12940

1975 to 9340, Qo 12941-13120

1976 to 9350, Qo 13121-13400

1977/78 Qo13401-13853

1979 Qo 13854-14030

1980 to 9360, Qo 14031-14228

"Bo" means "battery operated", not mechanical

"QO" means "quartz operated", i.e. quartz watch

Source: Konrad Knirim "Military Time Pieces"

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