Putting a year to this will be hard without any sort of serial number to go on.
Encore have been under the JHS umbrella since 1980 (there’s a little bit more of the brand history here; https://jedistar.com/encore/amp/) and I’d guess that a Strat copy with a Fender-style headstock has been a regular part of their catalogue from day one.
There may be some clues in the pickup cavities, in the neck pocket or under the pick guard if you feel like stripping the guitar down - otherwise, all we have to go on is the aged appearance of the pickups and that, to my mind, puts it somewhere in the late eighties or nineties.
Which is a wild guess on my part but with nothing else to go on….