I think thats a modified 1987 Saber.
Some of the earliest S's had the jack like that.
It also looks like a very early edge as I think I see the raised arm socket & the chrome would be correct for that period
The white finish was available then. It would have come with
mini switches for the pickups.
Though I would also expect to see the small dots through most of 1987.
I'm guessing it's either as modified late 1987 Saber or it was put together with mostly 87 parts which obviously someone put a Strat pickguard on.