  The flavour lepton symmetry is gauged for both the Standard Model flavor
group and its extension with three degenerate right-handed neutrinos. As a
consequence of anomaly cancellation, exotic leptons are introduced which induce
a see-saw mechanism that generates the masses of the SM leptons. The model is
compared with Minimal Flavour Violation, the difference between the low-energy
effective operators resulting is identified, as well as the distinctive
experimental signals, particularly promising in the $\mu-\tau$ sector.
