Why 2 serial #s? - now i'm cornfused

[zoner]

Why would a JS6000 have a 4-digit # on the neck plate and a different # on the back of the headstock? Also, the headstock # is F345xxx, wouldn't that mean it's a '93 or did they just grab a JS neck from a bin of leftovers from the previous year? None of this is really important, I know, but curious nonetheless. Thanks.
Z

[jemsite]

the necks are stamped or stickered when they're made. The JS plates are sequential and used as such. This axe should be '93 ('94) model... glen

[Rich]

Yup, the neck plates have no significance except that they continue serially up till the present. Before they started putting serial #'s on the head the plate # is the serial #, after that it just tells you how many Japanese JS models were made before yours. The necks on the 6000 are different so I'd assume they made a run of them pre-NAMM to have some ready for delivery when the model was debuted.