Modern import (2013+) — factory + YY + seq
2013+Three-letter factory code + 2-digit year + 5-digit sequence. Country prefix (letter 1): I = Indonesia, C = China, N = India, K = Korea, M/X = Mexico. Factory letter (letter 2): C = Cort, W = World Musical Instruments, S = Samick, Y = Yako, U = Unsung, H = Chushin Gakki (Harmony). Trailing J marks Jackson brand line. Documented codes: ICJ, ISJ, IWJ (Indonesia); CYJ, CJ, CUJ, CNJ, CSJ (China); NHJ (India); KCJ, KWJ, KSJ (Korea); plus 2-letter MJ and XJ (Mexico). Example ICJ1500001 = Indonesia Cort, 2015, #1.