1. Point of Manufacture
On solid body guitars and basses, the numbers 500 and above indicate Japanese
manufacture: RG550BK, SR800BK, BL850VB, the numbers 400 and
below indicate Korean manufacture: SR400BK, RX240MG, etc.
This system doesn’t apply to hollow bodies, and many signature guitars. J of
White Zombie’s signature model, the IJ100WZ is made in Japan, as is the
JPM100.
2. Pickup Configuration
On solid body guitars only, the last 2 numbers indicate pickup configuration:
20= two humbucking pickups with or w/o pickguard (ex: TC420MD)
30 = three single coils with or w/o pickguard (no current models)
40 = sin/sin/hum with a pickguard (ex: TC740MN)
50 = hum/sin/hum with a pickguard (ex: RG550BK)
60 = sin/sin/hum with no pickguard (no current models)
70 = hum/sin/hum with no pickguard (ex: RG570FBL)