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: Sometimes stamped on the brace under the fretboard. 📅 Common Serial Formats 8-Digit (Taiwan/Indonesia) : YMMDDUUU The 1st digit is the last digit of the year. 6-Digit (Japan 1969–1984) : YYMMUU The first 2 digits are the year (e.g., 71 = 1971). Letter-Letter-Number (Post-2001) : LLLDDUUUU

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