What model is this Ibanez S

[sevenstringer]

Can anyone help tell me what model this is:

Ibanez S body
22 Fret neck with oval inlays(custom made in the 21st fret)
Trans blue with what looks like a maple top
Black Chrome hardware
PUPs QM1,QM2,QMS1--hum-single-hum w/metal PUP rings
Binding on neck and headstock
Made in Japan

 

[feintguitarist]

Probably an older S540 custom of some sort..

Early 90's...What's the neck join like?

Looks really cool..I've seen a few Customs..and they all have gold hardware and some green finish..never dug them.

 

[Code001]

Serial number would help a lot.