  Alternative renormalizable minimal non-SUSY SO(10) GUT model is proposed.
Instead of a ${\bf 126}$-dimensional Higgs field, a ${\bf 120}$-dimensional
Higgs filed is ntroducedin addition to a ${\bf 10}$-dimensional Higgs field and
plays a crucial role to reproduce the realistic charged fermion mass matrices.
With contributions of ${\bf 120}$ Higgs field, the original Witten's scenario
of inducing the right-handed Majorana neutrino mass through 2-loop diagrams
becomes phenomenologically viable. This model inherits the nice features of the
conventional renormalizable minimal SO(10) GUT model with ${\bf 10}+{\bf
\overline{126}}$ Higgs fields, while supplemented with a low scale seesaw
mechanism due to the 2-loop induced right-handed Majorana neutrino mass.
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