Here’s a list of movement serial numbers that may help. It will give you an idea of when the movement was made at least.
Serial number Released
1,000,000 – 1,999,999 1894 43,000,000 – 43,999,999 1979
2,000,000 – 2,999,999 1902 44,000,000 – 44,999,999 1980
3,000,000 – 3,999,999 1906 45,000,000 – 45,999,999 1982
4,000,000 – 4,999,999 1910 46,000,000 – 46,999,999 1984
5,000,000 – 5,999,999 1915 47,000,000 – 47,999,999 1984
6,000,000 – 6,999,999 1923 48,000,000 – 48,999,999 1985
7,000,000 – 7,999,999 1920 49,000,000 – 49,999,999 1986
8,000,000 – 8,999,999 1934 50,000,000 – 50,999,999 1986
9,000,000 – 9,999,999 1939 51,000,000 – 51,999,999 1989
10,000,000 — 10,999,999 1944 53,000,000 – 53,999,999 1991
11,000,000 – 11,999,999 1947 54,000,000 – 54,999,999 1993
12,000,000 – 12,999,999 1950 55,000,000 – 55,999,999 1995
13,000,000 – 13,999,999 1952 56,000,000 – 56,999,999 1998
14,000,000 – 14,999,999 1954 57,000,000 – 57,999,999 1998
15,000,000 – 15,999,999 1956 58,000,000 – 58,999,999 1998
16,000,000 – 16,999,999 1958 59,000,000 – 59,999,999 1998
17,000,000 – 17,999,999 1959 60,000,000 – 60,999,999 1999
18,000,000 – 18,999,999 1961 61,000,000 – 61,999,999 2000
19,000,000 – 19,999,999 1962 62,000,000 – 62,999,999 2000
20,000,000 – 20,999,999 1963 63,000,000 – 63,999,999 2000
21,000,000 – 21,999,999 1964 64,000,000 – 64,999,999 2000
22,000,000 – 22,999,999 1965 65,000,000 – 65,999,999 2001
23,000,000 – 23,999,999 1966 66,000,000 – 66,999,999 2002
24,000,000 – 24,999,999 1966 67,000,000 – 67,999,999 2002
25,000,000 – 25,999,999 1967 68,000,000 – 68,999,999 2003
26,000,000 – 26,999,999 1968 69,000,000 – 69,999,999 2003
27,000,000 – 27,999,999 1968 70,000,000 – 70,999,999 2004
28,000,000 – 28,999,999 1969 71,000,000 – 71,999,999 2004
29,000,000 – 29,999,999 1969 72,000,000 – 72,999,999 2005
30,000,000 – 30,999,999 1969 73,000,000 – 73,999,999 2005
31,000,000 – 31,999,999 1969 74,000,000 – 74,999,999 2005
32,000,000 – 32,999,999 1970 75,000,000 – 75,999,999 2005
33,000,000 – 33,999,999 1971 76,000,000 – 76,999,999 2005
34,000,000 – 34,999,999 1972 77,000,000 – 77,999,999 2005
35,000,000 – 35,999,999 1972 78,000,000 – 78,999,999 2006
36,000,000 – 36,999,999 1973 79,000,000 – 79,999,999 2006
37,000,000 – 37,999,999 1973 80,000,000 – 80,999,999 2006
38,000,000 – 38,999,999 1974 81,000,000 – 81,999,999 2007
39,000,000 – 39,999,999 1975 82,000,000 – 82,999,999 2007
40,000,000 – 40,999,999 1977 83,000,000 – 83,999,999 2007
41,000,000 – 41,999,999 1978 84,000,000+ 2008
42,000,000 – 42,999,999 1979