Example: hm02316 = the 316th unit made on June 2 of 1961, 1971, 1981, 1991, or 2001. If you still can’t figure it out, please see Yamaha contact info at the bottom of this page. Tenryu/Wada Factory, Made in Japan, 1969-1984: ######. Custom Shop, Made in Japan, 1966-1985: 001-1042 in sequence Custom Shop, Made in Japan, 1986-1990: Letter-####, like so: J7012.
The number following the letter is the year, in this case . Using the charts, we see that H=1991 and P=September. Custom Shop, Made in Japan, 2004-: Letter-letter-letter-###-letter, like so: QLY111C. Yamaha Music Craft, Made in Japan, 1997-1999: Letter-letter-###-letter, like so: ON521J. (See previous entry for Yamaha Music Craft for more on the numbering.) Yamaha Music Craft, Made in Japan, 2001-: Letter-letter-letter-###-letter, like so: QIL123A.
The numbers for each year typically overlap, as there is always a transitional period between successive years and as necks that are made and serial numbered late in any given year are used on instruments assembled in the early months of the following year.
A new serial-numbering scheme was adopted toward the end of 2009 using the number 10 as a prefix, followed by a space, followed by seven digits.
These serial numbers did not identify the country of origin in the body of the number.
Instead, the instrument’s country of origin appears on the decal on the back of the headstock, near the serial number.