I've always used this one and it has always been correct:
It looks like 900,000 serial numbers were used in 1952 and then again in 1963. It's possible that your watch was produced in '63 but wasn't sold until '66. Sometimes they stamp the inside of the case back with the year.
...
1965 1,200,000
1964 1,100,000
1963 900,000
1962 764,000
1961 650,000
1960 520,000
1959 490,000
1958 426,000
1957 265,000
1956 212,000
1955 210,000
1954 950,000
1953 920,000
1952 900,000
1951 740,000
1950 700,000
1949 654,000
1948 572,000
1947 480,000
1946 425,000
1945 402,000
1944 288,000
1943 260,000
1942 206,000
1941 185,000
1940 57,000
1939 45,000
1938 28,000
1937 25,000
1936 20,000
1935 15,000
1934 10,000
1932 8,000
1931 7,000
1930 6,000
1929 5,000
1928 4,000
1927 3,000
1926 2,000
Edited by a mod Jul 23, 2020