Re: NGD 1989 RG560 Question
I still have both an 1989 Rg560 (lipstick red) and an 1989 Rg570 (black), both that I bought new in 89.
Both of them have "Ibanez Made in Japan" stamped 4 bolt neck plate, but interestingly, neither of them had the IBZ stamped pickups. I changed the bridge pickups long ago to Seymour Duncan Full Shred, but still have the original middle and neck pickups installed.
That being said, mine seem to be both much later in the year / production than yours, as their serials start with 909 on the 550, and 912 on the 570.
Other than those differences, everything else looks the same.