best educated guess is it is made by Samick.. most probably produced on 96'..
Here are my Bantam bass:
my XB-400 S/N: S6053895 (96' doesn't have print 'Made in Korea' I have done some research and 'S' preceding the serial number is Korean made)
my XB-500 S/N: 98100159 (98' has 'Made in Korea' printed under the serial number)
my XB-600 S/N: S4073427 (94' doesn't have print 'Made in Korea' printed under serial number)
I also have RB2000 which is the Rock Bass but it shares the same shape as Bantam Series. my RB2000 has 'Made in Korea' under the serial number.