  Let $K$ be a simple $2q$-knot with exterior $X$. We show directly how the
Farber quintuple $(A,\Pi,\alpha,\ell,\psi)$ determines the homotopy type of $X$
if the torsion subgroup of $A=\pi_q(X)$ has odd order. We comment briefly on
the possible role of the EHP sequence in recovering the boundary inclusion from
the duality pairings $\ell $ and $\psi$. Finally we reformulate the Farber
quintuple as an hermitian self-duality of an object in an additive category
with involution.
