Examples:
- Waterproof stamped on the back #956789, the first digit "9" is the year which in this case is 1969 because the "proof" mark was only used until June 1970 (approx), the second digit "5" is the month, so May, the last four digits are the number of watches produced in that month.
- Water resistant stamped on the back #7D6789, so "7" is 1977 because we know water resistant dident show until after June 1970, "D" is the month, in this case December and the four digits again is the number produced in that month.
- Year digit 1 to 9 is January to September the O is October, N is November and D is December.
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