it would be the 1600, but they only did it for a very short period of time and then withdrew it, I think probably because it was a bit head heavy (or body light). Or maybe because it was a limited edition.
It would look like this:
https://reverb.com/item/3462485-ibanez-sr1600-2013-poplar-burl-limited
which is a bit like if the 1700 wasn't varnished. Maybe that is light too.
My SRs seem to go in weight based on how much wenge they have on them, vs how much poplar, so by the time you get full wenge, stuff gets heavy.