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| Some pieces are date coded but most are not. Date codes could be marked with a four-digit number that represents the year so 1951 would be made in 1951. There are some pieces that could be marked with a two-digit code that represents the last two digits of the year so 51 would be made in 1951. |
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| A letter (dash) number code is also used but is has not been deciphered as of yet. |
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| Examples of a 4 digit code: |
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| Year/Month |
1902 |
1903 |
1904 |
1905 |
1906 |
1907 |
1908 |
1909 |
1910 |
1911 |
| January-December |
1902 |
1903 |
1904 |
1905 |
1906 |
1907 |
1908 |
1909 |
1910 |
1911 |
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| Year/Month |
1912 |
1913 |
1914 |
1915 |
1916 |
1917 |
1918 |
1919 |
1920 |
1921 |
| January-December |
1912 |
1913 |
1914 |
1915 |
1916 |
1917 |
1918 |
1919 |
1920 |
1921 |
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| Year/Month |
1922 |
1923 |
1924 |
1925 |
1926 |
1927 |
1928 |
1929 |
1930 |
1931 |
| January-December |
1922 |
1923 |
1924 |
1925 |
1926 |
1927 |
1928 |
1929 |
1930 |
1931 |
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| Year/Month |
1932 |
1933 |
1934 |
1935 |
1936 |
1937 |
1938 |
1939 |
1940 |
1941 |
| January-December |
1932 |
1933 |
1934 |
1935 |
1936 |
1937 |
1938 |
1939 |
1940 |
1941 |
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| Year/Month |
1942 |
1943 |
1944 |
1945 |
1946 |
1947 |
1948 |
1949 |
1950 |
1951 |
| January-December |
1942 |
1943 |
1944 |
1945 |
1946 |
1947 |
1948 |
1949 |
1950 |
1951 |
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| Year/Month |
1952 |
1953 |
1954 |
1955 |
1956 |
1957 |
1958 |
1959 |
1960 |
1961 |
| January-December |
1952 |
1953 |
1954 |
1955 |
1956 |
1957 |
1958 |
1959 |
1960 |
1961 |
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| Year/Month |
1962 |
1963 |
1964 |
1965 |
1966 |
1967 |
1968 |
1969 |
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| January-December |
1962 |
1963 |
1964 |
1965 |
1966 |
1967 |
1968 |
1969 |
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| Examples of a 2 digit code: |
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| Year/Month |
1902 |
1903 |
1904 |
1905 |
1906 |
1907 |
1908 |
1909 |
1910 |
1911 |
| January-December |
02 |
03 |
04 |
05 |
06 |
07 |
08 |
09 |
10 |
11 |
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| Year/Month |
1912 |
1913 |
1914 |
1915 |
1916 |
1917 |
1918 |
1919 |
1920 |
1921 |
| January-December |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
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| Year/Month |
1922 |
1923 |
1924 |
1925 |
1926 |
1927 |
1928 |
1929 |
1930 |
1931 |
| January-December |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
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| Year/Month |
1932 |
1933 |
1934 |
1935 |
1936 |
1937 |
1938 |
1939 |
1940 |
1941 |
| January-December |
32 |
33 |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
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| Year/Month |
1942 |
1943 |
1944 |
1945 |
1946 |
1947 |
1948 |
1949 |
1950 |
1951 |
| January-December |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
49 |
50 |
51 |
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| Year/Month |
1952 |
1953 |
1954 |
1955 |
1956 |
1957 |
1958 |
1959 |
1960 |
1961 |
| January-December |
52 |
53 |
54 |
55 |
56 |
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