σφραγιστήρ
From LSJ
οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well
English (LSJ)
ῆρος, ὁ,
A sealer, i.e. sealring, signet, Nicom.Ar.1.23, D.L.7.50.
German (Pape)
[Seite 1052] ῆρος, ὁ, der Siegler, der Siegelring (?).