Hi. I have an Avedis Zildjian Constantinople 15” hi hat pair. Great sound, from a professional drummer who is retired and interested in selling them. I’m helping him out and doing the research for him to figure out pricing. I can’t find any information or sales stats on this type of hi hat pair. Are they rare perhaps made between 1973 -1987? One mention was that they are so rare and popular, few musicians ever give them up. My friend has a Reverb store, what should I list these cymbals for?

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