Yamaha Guitar Serial Number Lookup/Decoder

Yamaha guitar serial numbers can generally be decoded by identifying the production year and month from the first few characters, often using a “YMMDDUUU” format (Year–Month–Day–Unit) or a letter-based code for older models. Most modern guitars (post‑2000s) use 3 letters followed by 6 numbers, where the first two letters indicate the year and the third indicates the month.

Decoding Steps & Formats

• Locate Serial Number: Usually stamped on the back of the headstock or on a label inside the soundhole.
• Modern (Post‑2000s, 3 letters + 6 numbers): Year = first two letters/numbers (e.g., QJ = 03 for 2003, HHI = 2011). Month = third letter (H=Jan, I=Feb, J=Mar, K=Apr, L=May, M=Jun, N=Jul, O=Aug, P=Sep, Q=Oct, R=Nov, S=Dec). Day = next two numbers.
• O vs 0 caveat (important): On some Yamaha serials, a zero can look like the letter O. For patterns like I0L033214 (often entered as IOL033214), treat the second character as the same code and cross-check with model year ranges and the country-of-origin label.
• Taiwan (1984–2002, Letter‑Letter‑#####): First letter = Year (P=1999, Q=2000). Second letter = Month (H=Jan, J=Mar, etc.). Next two numbers = Day.
• Vintage (1971–1980s, 8 digits): First digit is the year (e.g., 1 = 1971 or 1981), next two are the month, next two are the day.
• Older Vintage (Pre‑1971, 6–7 digits): These are often sequential and not directly date‑coded. Check for an ink‑stamped code inside (e.g., “45.12.28” indicates 1970).

Key Tips

• Country of Origin: Knowing if it was made in Japan, Taiwan, or Indonesia helps select the correct decoding chart.
• Repeat Cycles: Serial numbers may repeat every 10 years, requiring context to confirm the decade.
• Example: A serial number starting with HHI (e.g., HHI93032) indicates a production date of Feb 9, 2011.

For specific vintage models, consult Yamaha's official documentation.

Yamaha Serial Number Systems (PDF)