  We propose a theory for fermion masses and mixings in which an $A_4$ family
symmetry arises naturally from a six-dimensional spacetime after orbifold
compactification. The flavour symmetry leads to the successful "golden"
quark-lepton unification formula. The model reproduces oscillation parameters
with good precision, giving sharp predictions for the CP violating phases of
quarks and leptons, in particular $\delta^\ell \simeq +268 ^\circ$. The
effective neutrinoless double-beta decay mass parameter is also sharply
predicted as $\langle m_{\beta\beta}\rangle \simeq 2.65\ meV$.
