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 T-60 was the first guitar Peavey ever produced.
View Pro Series Guitars Japanese-made Takamine models distributed in Japan have their own serial-numbering scheme that can be used to reliably date them.
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).
It was conceived in 1976, first produced in 1977 (not really until 1978) and stayed in production into 1987.
This was the first guitar ever made with CNC machines, which by now most people who know the guitar know that Hartley Peavey and Chip Todd pioneered (The "T" in T-60 is for Todd as in Chip Todd who designed the guitar with Hartley).
An Ibanez serial number can tell you two things, year of manufacture and factory [or country] of manufacture.