So, I have a 15" OS hihat top IIa 887 grams and bottom is a IIIb 1228 grams. There is a few cracks in the hole of the top, but they havent spread in the 10 years I have had and used it. The bottom is a later acquisition, that have been cleaned somehow in later years. What is the approx. value of this set? I'm not gonna use them, but I have no idea what a fair price/trade would be.