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