See below for the formula used to tell the year of manufacture. Similarly, serial number 09050112 indicates the 112th guitar made during May 2009.In mid/late 2012, US distributed Japanese-built guitars switched to the year designation that guitars distributed in Japan use. The remaining four digits denote the instrument’s sequential number of manufacture among all the instruments made during the month indicated.For example, serial number 07100091 indicates a guitar built in 2007 (07), in October of that year (10), and that it was the 91st guitar made that month (0091). Pro Series ModelsJapanese-built Takamine Pro Series guitars can be reliably dated from the eight-digit serial numbers typically found at the neck block inside the instruments.The first two digits designate the year of manufacture, followed by two digits denoting the month.