Spector Kramer era serial number dating?

[maut]

Hi there,

 

I have an old Spector NS-2A which should be from the Kramer Korean made era.

The serial is engraved on the electric´s plastic cover: NS 8391

I haven´t found any info on the net regarding the exact dating by serial numbers on these basses. Maybe someone can help?

Thanks!

Edited November 16, 2017 by maut

[cetera]

Almost impossible to date. but it can be narrowed down to late 80's......

[maut]

Ok, thanks cetera... I was hoping for more though. :-)