From what I can tell, the "serial" number identifies which era of Strat it's based on (this is a 58/9 replica?) and is completely useless for dating the manufacture of the instrument.
I'd say it's pre'84 as I believe Tokai changed the name from Springy Sound to Goldstar Sound during '83.
If the 'Tokai' logo is block letters, it's an '83, if it's spagetti, mimicking the early Fender logo, it's '82 or earlier.
That's as much as I remember.
Cheers