Zildjian 14” Rock Hi Hats (Pair) 1981-1992 (“CO.” Stamps)Notes 1450g bottom hi hat 1250g top hi hat The CO stamps were the last unique signatures on Zildjian models until the company introduced their laser engraving system in 1994. They take their name from the CO in Zildjian CO whereas prior models read Zildjian Co. A Zildjian 14 Rock Hi Hats (Pair) 1981 1992 (CO. Stamps) in Excellent condition! At Evolution Music, we attempt to highlight cosmetic defects (if any) by picturing every angle of every piece of