in the early 80's, fernandes began making copies of telecasters, and stratocasters. they even shared the same headstock shape (as does yours). fender was not too happy about this, and they sued fernandes. fernandes was pressured into changing their headstock design around 1982(?). im not 100% sure on what year they changed it, but i have a fernandes 82-83 telecaster copy, and it has the redesigned fernandes headstock. i believe that your strat may be significantly older than you think.
however, i am no expert on these guitars. i just know that they are quite nice.