  After dimensional reduction the stationary spherically symmetric sector of
Einstein's gravity is identified with an SL(2,R)/SO(2) Sigma model coupled to a
one dimensional gravitational remnant. The space of classical solutions
consists of a one parameter family interpolating between the Schwarzschild and
the Taub-NUT solution. A Dirac Quantization of this system is performed and the
observables -- the Schwarzschild mass and the Taub-NUT charge operator -- are
shown to be self-adjoint operators with a continuous spectrum ranging from
$-\infty$ to $\infty$. The Hilbert space is constructed explicitely using a
harmonic space approach.
