  We demonstrate that VPMS J170850.95+433223.7 is a weak line quasar (WLQ)
which is remarkable in several respects. It was already classified as a
probable quasar two decades ago, but with considerable uncertainty. The
non-significant proper motion and parallax from the Gaia early data release 3
have solidified this assumption. Based on previously unpublished spectra, we
show that VPMS J170850.95+433223.7 is a WLQ at z = 2.345 with immeasurably
faint broad emission lines in the rest-frame ultraviolet. A preliminary
estimate suggests that it hosts a supermassive black hole of ~10^9 M_sun
accreting close to the Eddington limit, perhaps at the super-Eddington level.
We identify two absorber systems with blueward velocity offsets of 0.05c and
0.1c, which could represent high-velocity outflows, which are perhaps related
to the high accretion state of the quasar.
