  Due to internal symmetries of its ghost sector, the Poincare' generators of
the GZ-model are not unique. The model apparently has two linearly independent
symmetric and conserved energy momentum tensors. We show that these
energy-momentum tensors are physically equivalent and differ by unobservable
conserved currents only. There is a single physical energy-momentum operator
that is invariant under all symmetries of the ghost sector, including BRST.
This resolves concerns about Poincare' invariance raised by the explicit
$x$-dependence of the BRST operator. The energy, momentum and angular momentum
of physical states are well-defined quantities that vanish for the ground state
of this theory. We obtain and discuss the physical Ward identities resulting
from Poincare' invariance.
