  For a knot $K$ with $\Delta_K(t)\doteq t^2-3t+1$ in a homology $3$-sphere,
let $M$ be the result of $2/q$-surgery on $K$. We show that an appropriate
assumption on the Reidemeister torsion of the universal abelian covering of $M$
implies $q=\pm 1$, if $M$ is a Seifert fibered space.
