  We report on simultaneous optical and X-ray observations of the Seyfert
galaxy, NGC3147. The XMM-Newton spectrum shows that the source is unabsorbed in
the X-rays ($N_H<5\times10^{20}$ cm$^{-2}$). On the other hand, no broad lines
are present in the optical spectrum. The origin of this optical/X-rays
misclassification (with respect to the Unification Model) cannot be attributed
to variability, since the observations in the two bands are simultaneous.
Moreover, a Compton-thick nature of the object can be rejected on the basis of
the low equivalent width of the iron K$\alpha$ line ($\simeq130$ eV) and the
large ratio between the 2-10 keV and the [OIII] fluxes. It seems therefore
inescapable to conclude that NGC3147 intrinsically lacks the Broad Line Region
(BLR), making it the first "true" Seyfert 2.
