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The Serial Number Wizard is designed to provide "manufacture date" information for a guitar or bass.
Not ALL serial numbers are accounted for, so if the Wizard indicates an "Invalid Serial Number", first double check the serial number on the instrument and try again.
If the Wizard still indicates an "Invalid Serial Number" refer to the following PDF files for more details.
SERIAL NUMBER
DATE
YEAR(S)
UNIT #
NOTE: Serial Numbers repeat every 10 years.

If assistance is still required, you can email Yamaha Customer Support.