Hi hat to the degree that Wikipedia. Hihat, also hihat highhat, cymbals, foot operated which moves in turn moves metal mounted bracket.
Timeline cymbal stamps as reported by Robscott. Under the signature of the bell under the 1950s zildjian sticker. Label 1959 istanbul only authentic cymbal.
Avedis gallery zildjian as stated in Net. The avedis gallery logos disappear through the gallery, the production moves.