For example, 27136 should be February (2), 1967 (7) and the 136th instrument made that month. (i.e., 1974 would be 4) Last 3 digits = number of the instrument.
The last four numbers are sequential for the given year (all models combined) and are broken into two categories as follows: So, JT05070014 would be made at the Terada factory in July 2005 and would be the 14th of something special that year (all special models combined).
Unlike the pre-Fender codes, specific models are no longer designated within the serial number.
As of July 2011, the current thinking is that the first digit probably denotes the year, while the following numbers remain a mystery.
This only pertains the pre-Fender Korean-made guitars.
Most Electromatic hollowbodies carry a KS designation, although KP was fairly common prior to about 2007.
CY is usually seen on Electromatic solidbodies such as the Corvette/CVT.
Lower numbers will always appear on earlier guitars, higher numbers on later guitars.
Remember that 20 guitars will, of course, not begin with a 9.
For example, serial number JT03074463 would break down as: Of those, JT is by far the most common on the pro-line instruments.