Tampon (m)
(with) definite article: letrade mark ("signature") of the maker of a Cabrette, usually branded onto the chanter
Literally: "rubber stamp", "plug", &c.; Term, used by Ricros, not encountered in other sources; NB: ➺ homonym (lining of key cap).
Ricros, André & Chavanon, Michel (Recherches en archives): Les facteurs de cabrette. In: Ricros (et al.): La cabrette… (2017), p.430; NB: ➺ p.407 (marque au fer) & ill. (passim [29x]).