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in the MIKI serial pattern the third character indicates the month of manufacture
on the subject bicycle this character appears somewhat indistinct, to me it looks like it may be a letter K which would indicate a November build
in Japan cycle factories generally make the changeover of the production line for the coming model year in the month of September so a November produced bicycle would be a model for the coming year
according to the MIKI serial system the last number of the year this machine manufactured is a 9, indicating that the two possibilities are a nominal 1970 or 1980 model
View attachment 976574
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