If they are a set for $1690 then they are 100% fake
If they are $1690 each then they are genuine
Also genuines only come in PCD 112,114.3 and 120

If your after genuine I've got some for sale
they are 5x114.3
66.1 bore
18x8 +35
RS503

BBS Super RS RS503

works out to the price on 1.5 new ones