213=unit number and that last letter is an internal code. Using the charts, we see that H=1991 and P=September. The last three numbers indicate unit number. The number following the letter is the year, in this case. The letter at the beginning represents the month, so J would be March (see chart above). There are several other serial number configurations used by Yamaha over the years.Īlternate serial number configurations for Yamaha Classical and Acoustic Guitars
