  We have monitored a Type II outburst of the Be/X-ray binary MXB 0656-072 in a
series of pointed RXTE observations during October through December 2003. The
source spectrum shows a cyclotron resonance scattering feature at 32.8 +/- 0.5
keV, corresponding to a magnetic field strength of (3.67 +/- 0.06) x 10^12 G
and is stable through the outburst and over the pulsar spin phase. The pulsar,
with an average pulse period of 160.4 +/- 0.4 s, shows a spin-up of 0.45 s over
the duration of the outburst. From optical data, the source distance is
estimated to be 3.9 +/- 0.1 kpc and this is used to estimate the X-ray
luminosity and a theoretical prediction of the pulsar spin-up during the
outburst.
