The use of one verb (αματες/amatens) with the same value in the inscriptions I have already mentioned (see my posts Oenotrian amates. Part one / Oenotrian amates. Part two) and …
Because of its antiquity, αματες is in itself a strong argument for classifying it together with historically attested –t– (e.g. Paelignian coisatens, Marrucinian amatens, Volscian sistiatiens) and –tt– perfects (e.g. …